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Under-Sink Non-Electric RO System - U01

Name: Under-Sink Non-Electric RO System - U01
Rating: 5.00 (11 reviews)

Regular price £189.00 GBP ~~£227.00~~ 16% OFF

Tax included. Shipping calculated at checkout.

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Effective Date: July 2026
Last Updated: July 2026

At Purewell, we want you to feel confident when shopping for home and outdoor water filtration products. This Return & Refund Policy explains how returns, refunds, exchanges, damaged items, missing items, replacement filters, and product-specific return conditions are handled.

This Policy applies to purchases made directly through www.purewell.com. If you purchased a Purewell product through another retailer, marketplace, reseller, or distributor, please contact that seller directly for their return and refund policy.

1. 30-Day Return Window

We offer a 30-day return window. This means you may request a return within 30 days after receiving your item, provided that the item meets the eligibility requirements in this Policy.

To start a return, you must contact us before sending any item back. Items returned without prior authorization may not be accepted.

2. Return Eligibility

To be eligible for a return, the product must generally be:

Purchased directly from Purewell.com.
Returned within the applicable return window.
Unused, uninstalled, unfilled with water, and in the same condition as received.
Returned with original packaging, manuals, accessories, components, and proof of purchase.
Free from damage, stains, odors, contamination, scratches, dents, missing parts, or signs of improper use.

Purewell reserves the right to refuse a return or reduce the refund if the returned product does not meet these conditions, subject to applicable law.

3. Drinking Water Hygiene Policy

Because Purewell products are used for drinking water filtration, hygiene and product safety are important. Products that have been filled with water, installed, activated, primed, connected, used, or otherwise exposed to drinking water may not be eligible for resale or standard return processing.

For hygiene reasons, used water-contact components, opened consumable filters, and products that show signs of use may be non-returnable unless the return is related to a verified defect, damage, or incorrect item caused by Purewell.

4. Non-Returnable Items

The following items may not be eligible for return or refund unless required by law or unless the issue is caused by Purewell:

Used, installed, filled, activated, or water-exposed products.
Opened, used, activated, primed, expired, or contaminated replacement filters.
RO membranes, filter cartridges, carbon filters, gravity filter elements, outdoor filter elements, and other consumable filtration components once opened or used.
Products missing original packaging, manuals, accessories, or required components.
Products damaged by misuse, neglect, improper installation, unauthorized modification, or incompatible accessories.
Gift cards, digital products, final sale items, clearance items, or customized products where applicable.

5. Replacement Filters and Consumable Products

Replacement filters are consumable products. This includes gravity filters, RO filters, RO membranes, carbon filters, outdoor filter elements, bottle filters, straw filters, pump filters, and similar filtration components.

For safety and hygiene reasons, replacement filters may only be returned if they are unopened, unused, unprimed, uninstalled, and in original packaging, unless the item is defective, damaged, incorrect, or otherwise required by applicable law.

6. Gravity Water Filter Systems

For countertop gravity water filter systems, all chambers, lids, spigots, stands, water level windows, filters, washers, seals, and accessories must be returned complete and in original condition.

Gravity systems that have been assembled, filled with water, used for filtration, contaminated, dented, scratched beyond normal inspection, or returned with missing parts may not qualify for a full refund.

7. Countertop Reverse Osmosis Systems

Countertop RO systems must be returned with all tanks, pitchers, filters, membranes, power adapters, accessories, tubing, manuals, and packaging included, where applicable.

RO systems that have been installed, flushed, filled, activated, connected to power, connected to water, or used may be subject to inspection and may not qualify for a standard return due to hygiene, performance, and resale limitations.

8. Outdoor Water Purifiers

Outdoor water purifiers, filter pumps, water filter bottles, water filter straws, soft flasks with filters, and similar products must be returned unused, clean, dry, and complete with all original components.

Outdoor filtration products exposed to natural water sources, dirt, sand, mud, chemicals, biological material, or other outdoor contaminants may be non-returnable unless the issue is verified as a Purewell-caused defect, damage, or incorrect shipment.

9. Damaged, Defective or Incorrect Items

Please inspect your order as soon as it arrives. If you receive a damaged, defective, incorrect, or incomplete item, contact us as soon as possible so we can evaluate the issue and make it right.

To help us process the claim, please provide your order number, photos or videos of the product, photos of the packaging, shipping label, and a description of the issue. If the issue is caused by Purewell or our fulfillment process, you will not be required to pay return shipping for that issue.

10. Missing Items

If your order is missing a product, accessory, filter, manual, or required component, please contact us as soon as possible with your order number and photos of the package contents. We will review the issue and may send the missing item, provide a replacement, or offer another appropriate solution.

11. Return Shipping Costs

If the return is caused by customer preference, ordering error, change of mind, incorrect product selection, or other customer-related reasons, the customer is generally responsible for return shipping costs. The exact cost depends on the carrier or shipping service selected.

If the return is caused by Purewell, such as an incorrect item, damaged item, verified defect, or fulfillment error, Purewell will cover the return shipping cost or provide another suitable solution in accordance with this Policy and applicable law.

12. How to Start a Return or Exchange

To request a return or exchange, please use our Returns & Exchanges Portal, available on our website and in your customer account.

Simply enter your Order Number and the Email Address used for your purchase. If your order is eligible, you can submit your request online.

Once approved, we will email you a prepaid return label and return instructions. After we receive and inspect your returned item, we will process your refund or ship your replacement order, as applicable.

If you need assistance at any time, please contact us at info@purewell.com.

13. Return Address

Return addresses may vary depending on product type, order location, warehouse availability, and the reason for return. Please do not use any address published on the website or package unless we specifically provide that address for your return authorization.

Items sent to the wrong address, sent without authorization, or sent without tracking may be delayed, refused, or ineligible for refund.

14. Tracking Number Requirement

Once you ship a return, please provide the tracking number to Purewell promptly. We recommend using a trackable shipping service and keeping proof of shipment. Purewell is not responsible for returns lost in transit when the customer arranges return shipping.

15. Inspection and Refund Approval

After we receive your return, we will inspect the product to confirm condition, completeness, eligibility, and compliance with this Policy. We will notify you whether the refund is approved, partially approved, denied, or requires further review.

If the returned product is used, damaged, missing parts, missing packaging, contaminated, or not in eligible condition, we may reduce the refund, refuse the return, or return the item to you, subject to applicable law.

16. Refund Processing

If your refund is approved, the refund will generally be issued to the original payment method within 3–7 business days after approval. Your bank, credit card issuer, payment provider, or payment network may take additional time to process and post the refund.

Shipping fees, customs duties, import taxes, payment provider fees, and other third-party charges may not be refundable unless required by law or caused by Purewell’s error.

17. Exchanges

Where available, we may offer exchanges for eligible items. The fastest way to receive a different product may be to return the eligible item and place a new order after the return is approved.

Exchanges are subject to product availability, condition requirements, shipping limitations, and applicable law.

18. Promotions, Bundles and Gifts

Orders purchased with discounts, coupon codes, bundles, gifts, free items, or promotional offers may be refunded based on the amount actually paid after discounts. If a bundle or promotional set is returned partially, the value of any retained items, gifts, or discounts may be deducted from the refund.

Promotional items, free gifts, or bonus products may need to be returned with the original order to receive a full refund.

19. International Orders, Customs and VAT

For international orders, shipping costs, customs duties, import taxes, VAT, brokerage fees, or similar charges may be handled differently depending on destination country and checkout terms. Unless otherwise required by law or caused by Purewell’s error, customs duties, import taxes, VAT, and third-party fees are generally not refundable by Purewell.

20. EU and UK Consumer Rights

If you are a consumer located in the European Union, United Kingdom, or another jurisdiction with mandatory consumer protection rights, you may have additional rights that apply regardless of this Policy.

For eligible online purchases in the European Union, consumers generally have the right to withdraw from the contract within 14 days after receiving the goods, subject to legal exceptions. UK online consumers generally have similar cancellation rights. Certain items, including goods that are not suitable for return for health protection or hygiene reasons once unsealed after delivery, may be excluded where permitted by law.

Nothing in this Policy limits your mandatory statutory rights.

21. Warranty Claims vs Returns

A return request is different from a warranty claim. Returns are generally handled within the return window and based on product condition. Warranty claims are handled under the applicable product warranty and may relate to defects in materials or workmanship during the warranty period.

If your issue occurs after the return window, please contact us so we can determine whether warranty support may apply.

22. Water Quality and Performance Expectations

Water filtration performance, water taste, water clarity, flow rate, TDS readings, and filter lifespan may vary depending on local water quality, source water conditions, contaminant levels, water temperature, usage frequency, maintenance, and filter age.

Dissatisfaction based solely on taste preference, flow rate expectations, local water conditions, or misunderstanding of filtration technology may not qualify as a defect unless verified through product evaluation or required by applicable law.

23. Policy Updates

We may update this Return & Refund Policy from time to time to reflect changes in our products, operations, logistics, legal requirements, or customer service procedures. The latest version will be posted on this page with an updated date.

24. Contact Us

If you have questions about returns, refunds, exchanges, damaged items, missing items, or warranty support, please contact Purewell through the contact information provided on our website.

More Than a Product Claim: Evidence You Can Check

Certification standards and independent test reports help customers understand what a filtration product has actually been evaluated for. Instead of relying only on packaging, advertising, or marketplace descriptions, you can review the applicable standard, product model, tested claim, and supporting documentation.

Documentation Across Purewell Filtration Products Purewell filtration systems and replacement filters are supported by corresponding certification and/or test documentation. Customers can review system documents, filter documents, and performance reports through the Purewell Test Reports page.

Verifiable Evidence

NSF/ANSI 42

Drinking Water Treatment Units — Aesthetic Effects

What Does It Mean in Everyday Language?

This standard evaluates drinking-water treatment products for specified effects that influence the appearance, taste, smell, or everyday drinking experience of water.

Chlorine reduction, when listed

Taste and odor reduction, when listed

Particulate reduction, when listed

Materials, construction, and performance requirements

Certification Is Claim-Specific NSF/ANSI 42 does not automatically mean that a product reduces every contaminant. Check the certificate or listing for the exact model and certified reduction claims.

372

NSF/ANSI/CAN 372

Drinking Water System Components — Lead Content

What Does It Mean in Everyday Language?

This standard evaluates the lead content of materials and components that come into contact with drinking water, using defined calculations and verification procedures.

Evaluates wetted product components

Verifies applicable lead-content limits

Reviews materials used in the water pathway

Supports lead-content compliance verification

Lead Content Is Not Lead Reduction NSF/ANSI/CAN 372 evaluates lead content in product materials. It does not by itself certify that a filter removes lead already present in the source water.

From a Marketing Claim to Verifiable Evidence

Reliable documentation connects a standard to an identifiable product, a defined test scope, and a report or certificate that customers can review.

Identify the Standard Confirm whether the document refers to NSF/ANSI 42, NSF/ANSI/CAN 372, or another applicable standard.

Match the Product Check that the brand, product type, component, or model matches the item being sold.

Read the Test Scope Review exactly what was evaluated, including the reduction claim, material requirement, test condition, or performance category.

Review the Evidence Open the certificate, listing, or laboratory report instead of relying only on a badge or unsupported product description.

Product with Verifiable Documentation Claims can be checked against supporting evidence.

The applicable product or component can be identified.
The meaning and scope of the standard can be reviewed.
Specific performance claims can be checked against a report.
Customers can distinguish certification from general testing.
Material and performance claims have a documented basis.

Documentation does not mean every possible contaminant has been tested. It provides evidence for the specific scope shown in the applicable certificate or report.

Product Without Accessible Evidence Important claims may be difficult to confirm.

A standard logo may appear without a matching certificate.
The tested model may differ from the product being purchased.
Broad removal claims may exceed the actual test scope.
Lead-content compliance may be unclear or undocumented.
Customers may be unable to verify the source or date of a report.

An unavailable report does not automatically prove that a product is unsafe. However, it prevents customers from independently confirming the advertised certification and performance claims.

Documentation Available from Purewell

Purewell organizes supporting documents by system, filter, standard, and filtration performance so customers can review the evidence relevant to their product.

Filter System Documents Certification or test documentation associated with applicable complete filtration-system components.

Replacement Filter Documents Supporting documentation associated with applicable Purewell replacement filters and filter elements.

Performance Test Reports Laboratory reports covering specified filtration-performance categories under defined test conditions.

Customer-Accessible Files Downloadable documents provide more transparency than a badge, short claim, or marketplace product description alone.

Important Certification Notes

Reading the standard correctly is as important as seeing the certification or test badge.

Check the Exact Product or Component Certification and test results should be matched to the applicable product, filter, component, model, or documented product family.

Check the Exact Certified Claim A product certified under NSF/ANSI 42 may support only the reduction claims specifically shown in its certificate or listing.

372 Does Not Mean Lead Removal NSF/ANSI/CAN 372 concerns lead content in wetted materials. Lead reduction from source water requires a separate applicable filtration-performance claim.

Certification and Testing Are Different A certification, a component certification, and an independent laboratory test report are different forms of evidence and should be described accurately.

Review Test Conditions Results may depend on source-water conditions, flow rate, capacity, product setup, test protocol, and filter condition.

Replace Filters as Directed Certification or testing does not make a filter permanent. Follow the applicable installation, flushing, use, and replacement instructions.

Review the Documents Before You Choose

View Purewell system documents, replacement-filter documents, and filtration-performance reports. Select the files that correspond to the product and performance claim you want to verify.

View Test Reports

Hollow Fiber Ultrafiltration Technology

Fine Physical Filtration with a Hollow Fiber UF Membrane

Thousands of fine, straw-like membrane fibers create a compact physical filtration barrier. Water passes through microscopic pores, while larger suspended particles are retained on the other side of the membrane.

Standard UF Membrane Configuration Hollow fiber UF membrane technology is built into applicable Purewell portable filtration systems as a core physical filtration component—not an optional add-on.

Purewell Standard

Physical Separation Process

Source Water

Filtered Water

Larger suspended particles are retained

Water passes through microscopic membrane pores

How the Membrane Works

The membrane performs filtration through physical separation rather than adding chemicals to the water.

Source Water Enters Water reaches the outside of the hollow fiber membrane bundle.

Water Crosses the Membrane Wall Gravity, pressure, or the system pump moves water through the microscopic pores in each fiber.

Larger Particles Are Retained Suspended matter larger than the membrane pores is physically blocked from passing through.

Filtered Water Flows Out Water travels through the hollow center of the fibers and exits the filtration system for use.

Fine Physical Barrier Helps separate suspended sediment, fine particles, turbidity, and other contaminants larger than the membrane pores.

Large Filtration Area Bundles of narrow fibers provide a large membrane surface area within a compact filter structure.

Practical Water Flow Multiple hollow fibers work together to balance fine filtration with practical flow for portable use.

No Chemical Additives The membrane filters through physical separation and does not add treatment chemicals to the source water.

✓ Designed to Help Reduce

Suspended sediment and fine particles
Turbidity and visible particulate matter
Microplastics larger than the membrane pores
Certain microorganisms, depending on membrane specifications

i Understand the Filtration Limit

Does not desalinate water or remove dissolved salts
Does not soften hard water by itself
May not reduce all dissolved chemicals or metal ions alone
Additional filter media may be used for broader filtration

Important Use and Care Notes

Proper use and maintenance help protect membrane performance and maintain water flow.

Choose the Clearest Available Water Avoid heavily polluted water whenever possible. Allow sediment to settle or use a pre-filter when the source water is highly turbid.

Do Not Use with Saltwater or Chemicals The membrane is not designed for seawater, industrial wastewater, oil-contaminated water, or chemically polluted sources.

Rinse or Backwash as Directed Clean the membrane according to the product instructions when flow becomes slower due to accumulated particles.

Protect the Wet Membrane from Freezing Once used, water may remain inside the fibers. Freezing can damage the membrane structure and affect filtration integrity.

Follow Storage Instructions Clean and store the filter as described in the product manual when it will not be used for an extended period.

Replace at the End of Service Life Replace the filter when its rated capacity is reached, the membrane is damaged, or normal flow cannot be restored after cleaning.

Filtration performance varies by product model, membrane specification, source-water quality, operating conditions, and maintenance. Hollow fiber UF filtration is one component of the complete filtration system.

Silver Ion Bacteriostatic Support

Built-In Protection for the Filter Media

Silver-ion-treated media is designed to help inhibit bacterial growth within the filter material. It supports filter-media hygiene between uses while working alongside the system’s primary filtration technologies.

Standard Silver-Ion-Treated Filter Media Where silver-ion-treated media is listed in the product specification, it is included as part of the standard Purewell filter construction—not offered only as an optional upgrade.

Purewell Standard

Protection Within the Filter Media

Water Enters the Filter

Water Continues to the Next Stage

Ag+

Silver ions are integrated into the treated filter media

Helps inhibit bacterial multiplication within the media

Supports the filter material—it is not a standalone water disinfectant

How Silver Ion Support Works

Silver ions are incorporated into selected filtration media to provide bacteriostatic support inside the cartridge.

Silver Ions Are Integrated into the Media The silver-ion component is distributed within or applied to the selected filter material during manufacturing.

Water Contacts the Treated Surface As water moves through the cartridge, it contacts the silver-ion-treated filtration media.

Growth Within the Media Is Inhibited The silver-ion treatment helps limit bacterial multiplication on or within the filter material during normal use.

Primary Filtration Stages Continue the Work Carbon, ceramic, UF, or other specified filtration stages perform the system’s primary contaminant-reduction functions.

Bacteriostatic Does Not Mean Sterilizing Silver-ion-treated media is intended to help control growth inside the filter. It should not be presented as proof that bacteria, viruses, or other microorganisms have been removed from the source water.

Helps Inhibit Growth Supports control of bacterial growth within the treated filtration material during normal product use.

Supports Filter-Media Hygiene Helps manage microbial activity inside the filter material rather than serving as the system’s primary filtration barrier.

Integrated into the Cartridge The treated material is built into applicable Purewell filters and does not require the user to add a separate treatment chemical.

Complements Other Media Works alongside activated carbon, ceramic, UF, or other specified filtration materials in a multi-stage filter design.

✓ Designed to Support

Bacteriostatic protection within treated filter media
Control of bacterial multiplication inside the cartridge
Filter-media hygiene during normal product use
Multi-stage filtration when paired with other media

i Not Intended to Replace

A validated microbiological filtration barrier
Boiling, disinfection, or official boil-water guidance
UF, RO, UV, or other specified treatment technologies
Timely cleaning, flushing, and filter replacement

Important Use and Care Notes

Silver-ion support does not replace correct filter preparation, maintenance, or appropriate source-water selection.

Flush Before First Use Prepare and flush the filter according to the product instructions before using the filtered water for drinking.

Use an Appropriate Water Source Silver-ion-treated media alone does not make sewage, industrially polluted water, saltwater, or other unsafe sources suitable for drinking.

Do Not Open or Modify the Filter Do not remove, add, regenerate, or alter the internal filter media. Use the cartridge only in its original configuration.

Replace the Filter on Schedule Bacteriostatic support does not make a filter permanent. Replace it when the rated capacity or recommended service period is reached.

Avoid Hot Water and Chemicals Do not use hot water, bleach, detergents, or treatment chemicals unless they are specifically permitted in the product instructions.

Avoid Extended Water Stagnation Follow the recommended flushing and storage procedure after extended periods of non-use or when water has remained inside the system.

Follow Public Health Advisories During a boil-water notice or known microbiological event, follow instructions from the relevant local health authority.

Check the Product Specification Silver-ion content, media type, intended use, and performance claims may vary between Purewell filter models.

Silver-ion-treated media is intended to help inhibit bacterial growth within the filter material. It is not a standalone disinfectant and does not by itself establish that source-water microorganisms have been removed. Performance depends on the media formulation, product design, water quality, operating conditions, maintenance, and timely replacement. Refer to the applicable Purewell product specifications and test information for model-specific claims.

Coconut Shell Activated Carbon Technology

Coconut Shell Activated Carbon Designed to Improve Water Taste and Odor

Where listed in the applicable Purewell product specification, the filtration media uses activated carbon derived from coconut shells. The coconut shells are processed to create a network of microscopic pores and a large internal surface area. As water moves through the media, certain compounds are attracted to and held on the carbon surface through a process known as adsorption.

Coconut Shell–Derived Activated Carbon Media Where activated carbon is listed in the product specification, Purewell uses activated carbon derived from coconut shells as part of the standard filter construction rather than offering it only as an optional upgrade.

Purewell Standard

Adsorption Inside the Carbon Media

Incoming Water

Water Flows Out

Water carries chlorine, taste, odor, and certain organic compounds

Certain compounds are held within the porous carbon surface

Water continues through the filtration system

How Activated Carbon Works

Coconut shells are converted into highly porous activated carbon. The media primarily works through adsorption, meaning certain compounds are attracted to the carbon surface instead of simply being screened out by pore size.

Water Enters the Carbon Media Source water flows around and between the activated carbon particles inside the filter.

Water Contacts the Porous Coconut Carbon Processing the coconut shell material creates microscopic pores and a large internal surface area for water and dissolved compounds to contact.

Certain Compounds Are Adsorbed Chlorine, taste-and-odor compounds, and certain organic substances may be attracted to and held on the carbon surface.

Water Continues Through the Filter After contacting the carbon media, water moves to the next filtration stage or exits the system, depending on the filter design.

Improves Taste and Odor Helps reduce compounds that can create unwanted tastes or odors in drinking water.

Helps Reduce Chlorine Activated carbon is commonly used to help reduce chlorine taste and odor in treated municipal water.

High Internal Surface Area A network of microscopic pores creates extensive contact area within a compact amount of filter media.

No Treatment Chemicals Added Activated carbon performs through surface adsorption and does not require chemicals to be added to the water.

Coconut Shell–Derived Media Uses activated carbon made from processed coconut shells, where specified for the applicable Purewell filter.

✓ Designed to Help Reduce

Chlorine taste and odor
Unpleasant tastes and smells
Certain volatile organic compounds
Certain adsorption-sensitive organic substances

i Understand the Filtration Limit

Does not normally reduce dissolved salts or TDS
Does not soften hard water by itself
Is not a complete microbiological barrier on its own
Does not reduce every contaminant without additional media

Important Use and Care Notes

Correct preparation and timely replacement help maintain adsorption performance and water quality.

Flush Before First Use Flush the filter according to the product instructions before drinking. This helps remove loose carbon fines and trapped air.

Temporary Carbon Fines May Appear A small amount of dark carbon dust may appear during initial rinsing. Continue flushing until the water runs clear.

Use Within the Recommended Temperature Range Do not use hot water unless the specific product instructions state that the filter is designed for hot-water use.

Use with an Appropriate Water Source Activated carbon alone does not make microbiologically unsafe, industrially polluted, or saltwater sources suitable for drinking.

Replace the Filter on Schedule Adsorption sites gradually become occupied. Replace the filter when its rated life is reached or when taste and odor reduction noticeably declines.

Follow Storage Instructions Clean and store the filter as directed when the system will not be used for an extended period. Do not leave stagnant water in the system longer than recommended.

Coconut Allergy Precaution This filtration media is derived from coconut shells. People with a known coconut allergy or sensitivity should review the product materials and consult a qualified healthcare professional before use.

Filtration performance depends on the activated carbon type, carbon quantity, contact time, water quality, flow rate, product design, and maintenance. Specific contaminant-reduction claims should be based on the applicable Purewell product specifications and test results.

Ask about Under-Sink Non-Electric RO System - U01

Product Details

Non-Electric Tankless RO System

U01 Non-Electric Tankless Reverse Osmosis System

Designed for under-sink use, the U01 RO system runs on household water pressure with no electricity required. Its compact tankless design supports 7-stage filtration, fast flow, smart monitoring, and efficient water use for everyday drinking water.

No Electricity Required 7-Stage Filtration 800 GPD Flow Capacity 3:1 Pure-to-Drain Ratio

Compact Tankless Design

Measures approximately 5.7" L x 5.7" W x 16" H to help save under-sink storage space.

Smart Monitoring

Includes a real-time TDS display, pressure gauge, and filter installation month indicator.

Core Product Benefits

Built for homes that want RO filtration without electrical power, pump noise, or a bulky storage tank.

No Electricity, Low Noise

7-Stage RO Filtration

Composite filtration technology is designed to help reduce TDS, PFAS, fluoride, arsenic, chlorine, and other common contaminants.

Space-Saving Tankless Build

The compact design fits under the sink without a bulky water storage tank, helping keep water freshly filtered.

Efficient 3:1 Ratio

Produces up to 3 cups of purified water for every 1 cup of drain water under proper conditions.

Fast Flow Performance

Rated up to 800 GPD under optimal water pressure and temperature, helping reduce wait time for daily use.

DIY-Friendly Setup

Color-coded quick-connect tubing helps make installation more straightforward for most household setups.

Filtration Performance

The U01 system combines PP cotton, carbon block, and reverse osmosis filtration to support cleaner, better-tasting drinking water.

Filtration Method	PP cotton, carbon block, and reverse osmosis
Filtration Stages	7-stage filtration
Contaminant Reduction	Designed to help reduce TDS, PFAS, chlorine, heavy metals, fluoride, arsenic, and microplastics.
Certification	NSF/ANSI 58 certified composite filtration technology, according to the source product information.

Filtration performance may vary based on feed-water quality, water pressure, temperature, and filter condition.

Product Specifications

Product Type	Non-electric tankless under-sink RO system
Installation Type	Under sink
Power Source	No electric drive required
Pure-to-Drain Ratio	3:1 under proper operating conditions
Flow Capacity	Up to 800 gallons per day under optimal conditions
Dimensions	Approximately 5.7" L x 5.7" W x 16" H
Item Weight	Approximately 8.4 lb
Material	Food-grade PP

User Guide

User Guide for the U01 Non-Electric Tankless Under-Sink RO System

Follow this quick guide to install, flush, and maintain your U01 non-electric under-sink reverse osmosis system for daily drinking water use.

Before Installation

Confirm that your under-sink space can fit the system body and tubing.
Check that household water pressure meets the system requirements.
Identify the cold-water supply line before connecting the RO system.
Make sure the filters are seated properly before first use.

Basic Setup Steps

Connect the Water Line

Connect the system to the cold-water supply using the included quick-connect tubing.

Install the Faucet

Install the drinking water faucet and connect it to the filtered water outlet.

Connect the Drain Line

Route the drain water line correctly to support proper RO operation.

First Use

Open the cold-water supply and check all tubing connections for leaks.
Flush the system according to the user manual before drinking the filtered water.
Check the TDS display and pressure gauge after setup.
Record the filter installation month using the manual filter indicator.

For best performance, always flush new filters before normal use and replace filters on schedule.

Daily Use Tips

Use the system for cold-water filtration only.
Monitor the TDS display for changes in water quality.
Check the pressure gauge if flow becomes slower than usual.
Replace filters when flow, taste, or TDS readings indicate reduced performance.

How It Works

How the U01 Non-Electric Tankless RO System Works

The U01 under-sink RO system uses household water pressure, multi-stage filtration, and a tankless design to deliver filtered drinking water without electricity.

Water Flow Process

Tap Water Enters

Cold tap water enters the system through the under-sink water line.

Pre-Filtration

PP cotton and carbon block filtration help reduce sediment, chlorine, taste, and odor.

RO Filtration

The reverse osmosis membrane helps reduce TDS, PFAS, fluoride, heavy metals, and other common contaminants.

Filtered Water Out

Filtered water flows directly to the drinking faucet, while drain water exits through the drain line.

Key Working Principles

No Electric Drive Required

The system is powered by household water pressure, so it does not need a power outlet or electric pump.

Tankless Fresh Filtration

Filtered water is produced on demand without a bulky storage tank, helping reduce stagnant water concerns.

Efficient 3:1 Pure-to-Drain Ratio

Under proper operating conditions, the system can produce 3 cups of purified water for every 1 cup of drain water.

Smart Monitoring

The TDS display, pressure gauge, and filter month indicator help you monitor system performance and maintenance timing.

Actual performance may vary based on feed-water quality, water pressure, water temperature, and filter condition.

Filter Replacement

Filter Replacement for the U01 Under-Sink RO System

Replace filters on schedule to help maintain stable flow, clean taste, and reliable RO filtration performance.

Recommended Replacement Schedule

U01-PP1 Pre-Filter	Replace every 3-6 months, depending on water quality and daily usage.
U01-RO1 RO Filter	Replace every 6-12 months, depending on water quality and daily usage.
Full Filter Set	Use the U01-PR1 replacement filter set when replacing both the pre-filter and RO filter together.

Actual filter life may vary based on local water quality, water pressure, temperature, and household water use.

When to Replace the Filters

Replace the Pre-Filter If:

Water flow becomes slower than usual.
The filter has been used for 3-6 months.
Feed water contains visible sediment or rust.
The system pressure changes noticeably.

Replace the RO Filter If:

TDS readings rise noticeably.
Filtered water taste changes.
The filter has been used for 6-12 months.
RO filtration performance appears reduced.

Basic Replacement Steps

Turn off the cold-water supply before replacing filters.
Remove the used filter cartridge according to the system manual.
Install the new filter and make sure it is fully seated.
Turn the water supply back on and check for leaks.
Flush the new filter before normal drinking water use.
Update the manual filter installation month indicator.

List

U01 Non-Electric Tankless Under-Sink RO System Overview

A quick list of key features, specifications, and compatibility details for the U01 under-sink reverse osmosis water filtration system.

Key Features

Filtration

7-stage reverse osmosis filtration
Helps reduce TDS, PFAS, chlorine, fluoride, heavy metals, and microplastics
PP cotton, carbon block, and RO filtration

Design

Tankless under-sink installation
No electric drive required
Compact body saves cabinet space

Use and Monitoring

Real-time TDS display
Top-cover pressure gauge
Manual filter installation month indicator

Quick Specifications

Product Type	Non-electric tankless under-sink RO system
Installation	Under sink
Power Source	No electricity required
Flow Capacity	Up to 800 GPD under optimal conditions
Pure-to-Drain Ratio	3:1 under proper operating conditions
Dimensions	Approximately 5.7" L x 5.7" W x 16" H
Weight	Approximately 8.4 lb
Material	ABS

Best For

Homes that want RO filtration without an electrical outlet under the sink.
Kitchens where cabinet space is limited.
Users who prefer a tankless system with on-demand filtered water.
Households looking for fast flow and lower drain water compared with many traditional RO systems.

Video

Under Sink Non-Electric RO System Setup Video

Watch this step-by-step guide to install the U01 Non-Electric Tankless RO Water Filter System, connect the under-sink tubing, set up the faucet and drain line, and prepare the system for first use.

Installation & First-Use Guide

U01 Tankless RO System Setup

This video walks through the basic installation process for the U01 under-sink RO system. Follow the guide before first use to confirm the filter, water lines, faucet, and drain connection are installed correctly.

Recommended before first use Shows under-sink system placement and setup Explains feed-water, purified-water, and drain connections Covers faucet installation and tubing connection Helps confirm correct setup before daily use

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5 stars: 11 (100%)
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Complete, well-designed system that just makes sense

This RO system is seriously impressive. You can tell right away it’s been thoughtfully designed—from the layout to the included components. It comes as a very complete package, including the faucet, so you’re not scrambling to buy extra parts mid-install.

The tankless design keeps everything compact and clean under the sink, and the system runs ultra-quiet, which is a huge plus. The real-time TDS display and pressure gauge are great touches—they make it easy to see exactly what’s going on instead of just hoping everything is working correctly.

Water flow is strong for an RO system, and overall it just feels convenient and modern compared to older setups. If you’re looking for a high-quality, all-in-one filtration system that’s easy to live with day-to-day, this is a great choice.

Great system to have

I love this system! It was easy to install, after reading through the instructions a couple of times (that’s my preference though) and the water is great now. No complaints at all with this and I love that it doesn’t require any electric hookups. Highly recommend!

Tankless RO, no electricity, amazing water quality

this Purewell tankless RO system is impressive because it delivers 800 gallons per day without needing a pump or electricity which means zero noise under the sink and no power cable to deal with, the 2:1 pure-to-drain ratio is very efficient compared to older RO systems that waste way more water, the 7-stage NSF/ANSI 58 certified filtration removes PFAS, TDS and a wide range of contaminants, install was straightforward under the sink and the water tastes noticeably cleaner and better than before, the tankless design also means no stale stored water — really well engineered RO system that punches above its price.

Great addition if you have yucky water

We have unpleasant tasting water, so we were happy to get this reverse osmosis filter to improve our water taste. My husband is a pretty accomplished home DIYer, so he felt comfortable installing it himself. If you're not a DIYer, it would still be a quick (and hopefully cheap) install by a plumber or handyman. He said the instructions were decently clear and he didn't struggle much. We have ample under-sink space so that wasn't a problem for us, but definitely pay attention to the dimensions before ordering. The water tastes much better now and the flow doesn't seem to be impeded at all by the filter. This was a good addition for our family, and I think the price is pretty fair.

High-capacity filtration with modern features

This system delivers filtered water quickly without the bulky storage tank found in many traditional reverse osmosis systems. The real-time TDS display and pressure gauge make monitoring performance easy, while the high flow rate helps eliminate the waiting that often comes with smaller filtration systems.

Water quality improved noticeably, operation remained quiet, and the overall design feels thoughtfully engineered. The installation requires some planning, but once operational, it performs exceptionally well. For households looking for a premium filtration solution, it checks nearly every box.

Truly, an incredible filtration device for your home at an excellent price

These purewell water filters I have to say are the easiest and best filtration of any I have tried. First, the price is just unbelievable because it’s a very easy to use and set up product from out of the box to attach to your sink less than 20 minutes. If you need a little help, you don’t need a plumber. This is something you can do on your own no problem. Just follow the instructions. It’s very easy. The filtration does not slow down your water pressure at all, but it gives you the best tasting water and it also feels so much more balanced and removes the harmful heavy minerals that can cause buildup on your skin hair and appliances. This is seriously a product that every household needs these days because we have a lot of extra that we don’t need in our water supply and this will maintain a perfect balance for your home. This is priced so well I would get this as a housewarming gift or just to add to anyone’s home. It is made extremely well. You can tell you’ll have this for many many years to come and again don’t be scared of installing this it takes zero know how and just a little bit of effort. You’ll be very happy and pleased that you got this for your home and realized just how beneficial it is.

No electrical cords necessary

There are many places today that have less than healthy water coming out of their tap and I live in one of those. Because I did not want to deal with water delivery or having to constantly go out to stores for water I thought I would try and find something that would be effective at making my tap water healthier for drinking. When I saw this I was curious and thought this might be just what I was looking for. I was absolutely right!
Made my tap water taste noticeably better. Took all of the weird chemical flavor out of it and now it just tastes clean. I also notice that my dishes that I hand wash do not have the calcium like deposits on them anymore when they dry in the air. That is amazing to me.
I anticipated this being a little difficult to install. I have very little in the way of DIY skills so if I can install this that is saying something. I did have a tiny bit of help but not much at all and was able to get this put in and working. I am so pleased with it and recommend this pure will tankless water purifier to anyone who needs something like this.

Very easy to install

I looked at other systems that had complicated installations and were higher priced than the Purewell system. I was also familiar with the Purewell brand.
The filter is smaller than a lot of its competitors. The size makes it convenient, it takes up very little space under the kitchen sink, which never has enough room. Not needing an electric power is what really sets this filter apart from the others. There is no need for an electrician. This system can be setup on your own. It is quiet. I can't hear it at all. We use it solely for drinking water on top of our water softener. The water taste Great and is crystal clear. You can see and taste that Purewell put some work into the system. I wouldn't look at another brand at this point. We'll worth every penny.

Reverse Osmosis water filtration system.

This Purewell tankless reverse osmosis water filtration system is a simple and effective way to cleanup and purify the tap water coming from your kitchen sink.

The unit comes with all of the necessary instructions and parts needed to be able to successfully install this by yourself.

The unit requires no electricity and emits no noise while running and will provide you with a much healthier form of drinking water.

Great for regular daily drinking water as well as for water for cooking.

Every household should consider adding one of these units to their kitchen.

Quiet, Efficient, and Space Saving

The tankless design is a big advantage here. It saves space under the sink and runs quietly without the bulk of a traditional tank system.

Filtration is strong, and the improved water-to-drain ratio makes it more efficient than older systems. If you want a cleaner setup without the noise and size, this is a solid option.

Great addition if you have yucky water

Under-Sink Non-Electric RO System - U01

1. 30-Day Return Window

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4. Non-Returnable Items

5. Replacement Filters and Consumable Products

6. Gravity Water Filter Systems

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22. Water Quality and Performance Expectations

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Durable, Coating-Free Construction for Everyday Water Contact

Why 304 Stainless Steel Is Used

✓ What the Material Supports

i What the Material Does Not Mean

Important Use and Care Notes

More Than a Product Claim: Evidence You Can Check

NSF/ANSI 42

What Does It Mean in Everyday Language?

NSF/ANSI/CAN 372

What Does It Mean in Everyday Language?

From a Marketing Claim to Verifiable Evidence

Documentation Available from Purewell

Important Certification Notes

Review the Documents Before You Choose

Fine Physical Filtration with a Hollow Fiber UF Membrane

How the Membrane Works

✓ Designed to Help Reduce

i Understand the Filtration Limit

Important Use and Care Notes

Built-In Protection for the Filter Media

How Silver Ion Support Works

✓ Designed to Support

i Not Intended to Replace

Important Use and Care Notes

Coconut Shell Activated Carbon Designed to Improve Water Taste and Odor

How Activated Carbon Works

✓ Designed to Help Reduce

i Understand the Filtration Limit

Important Use and Care Notes

U01 Non-Electric Tankless Reverse Osmosis System

Core Product Benefits

No Electricity, Low Noise

7-Stage RO Filtration

Space-Saving Tankless Build

Efficient 3:1 Ratio

Fast Flow Performance

DIY-Friendly Setup

Filtration Performance

Product Specifications

User Guide for the U01 Non-Electric Tankless Under-Sink RO System

Before Installation

Basic Setup Steps

Connect the Water Line

Install the Faucet

Connect the Drain Line

First Use

Daily Use Tips

How the U01 Non-Electric Tankless RO System Works

Water Flow Process

Tap Water Enters

Pre-Filtration

RO Filtration

Filtered Water Out