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K Series Specialty Add-On Filters

Regular price $59.99 USD $59.99 0% OFF


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Filtration Stages: 5-Stage Reduce Fluoride

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Delivery & Return

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.

We're Here to Help

Need help with your return, exchange, warranty, or product? Contact our team—we'll be happy to assist you.

Contact Support

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Test Reports

Ask about K Series Specialty Add-On Filters

Product Details
Product Type Supplemental Filter
Filtration Options 5-Stage / 3-Stage
Required Pairing Core Filter
Package Quantity 1 Box / 2 Supplemental Filters
Filter Life Up to 200–1,000 Gallons per Box
Flow Rate Depends on Core Filter Flow and Water Pressure
Series K Series
Filter Size Approx. 2.76 in × 6.30 in / Φ7 × 16 cm
Important Use Add-on filter only. Not intended to be used alone.
Filtration Options & Item Numbers

5-Stage Reduce Fluoride

Item No. K8003
Filter Material
  • First PP Cotton
  • Activated Carbon
  • Second PP Cotton
  • Fluoride Reduction Material
  • Third PP Cotton
Key Functions
Reduces Chlorine Reduces Fluoride Add-on Filtration
Performance Details
Filter Life Up to 1,000 Gallons per Box
Box Weight Approx. 1.39 lb Net / 1.52 lb Gross

3-Stage Alkaline Filter

Item No. K8002
Filter Material
  • First PP Cotton
  • Alkaline Material
  • Second PP Cotton
Key Functions
Raises PH Level Add-on Filtration
Performance Details
Filter Life Up to 200 Gallons per Box
Box Weight Approx. 1.39 lb Net / 1.52 lb Gross
Use Notes
01

This is a supplemental filter and must be used together with compatible K Series or SS Series core filters.

02

Choose 5-Stage Reduce Fluoride if you want added fluoride reduction after the core filter stage.

03

Choose 3-Stage Alkaline Filter if you want an additional alkaline material layer designed to raise PH level.

04

Also works with Travel, Big, Royal, Imperial, Light, and Crown Berkey models as an additional gravity filter option.

05

Do not over-tighten during installation. Make sure the supplemental filter is securely attached to the core filter stem.

06

Replace the supplemental filters when the rated capacity is reached or when water flow becomes noticeably slower.

Note: This product is an add-on supplemental filter and is not designed to replace the main core filter by itself. Filter life and flow rate may vary depending on source water quality, water pressure, core filter condition, usage frequency, and maintenance conditions. Third-party brand and model names are used for compatibility reference only.
User Guide
Supplemental Filter Guide

How to Use the Supplemental Filter

Follow these simple steps to prime, install, and use the supplemental filter correctly with your core filters.

Step 01

Prime the Supplemental Filter

Before installation, remove the red sealing caps, place the priming washer on the inlet side, and rinse the filter under running water.

1
Remove the red sealing caps from both ends of the supplemental filter.
2
Place the black priming washer on the inlet side of the supplemental filter.
3
Connect the filter to the faucet outlet using the priming washer, then flush for at least 120 seconds or until water runs clear.
Tip: Priming helps flush loose particles before the supplemental filter is connected to the core filter.
Visual Guide Remove Caps → Add Washer → Rinse
Remove the sealing caps from both ends.
→
Place the priming washer on the inlet side.
→
Flush for at least 120 seconds until water runs clear.
Step 02

Install Below the Core Filters

Attach each supplemental filter to the stem of the core filter by turning it clockwise until secure.

1
Unscrew the wing nut at the bottom of the upper chamber used to secure the core filter.
2
Hold the core filter firmly and attach the supplemental filter to the core filter stem by turning it clockwise until secure.
3
Fill the upper chamber with water and discard the first batch of filtered water.
Note: Some filters may require additional force to thread onto the stem. Do not overtighten.
Visual Guide Unscrew → Attach → Ready
Unscrew the wing nuts below the core filters.
→
Turn clockwise to attach the supplemental filters.
→
Fill with water and discard the first batch after installation.
Step 03

Important Notice

Follow these care tips to help maintain proper use and avoid clogging, poor flow, or incorrect filtration.

1
Do not use the filter to filter hot water.
2
This filter cannot remove color from beverages such as cola.
3
This filter cannot reduce the TDS value of water.
4
This filter may reduce the filtration flow rate by 15–20%.
5
When the lower chamber is full, the filter may be submerged. This is normal and safe for use.
6
If unused for more than 3 days, remove all filter elements and allow the parts to dry.
7
Do not use detergents to clean the filter elements, as this may cause clogging.
If you notice clogging, strange taste, broken filters, or poor filtration, please contact us by email.
Care Tips Use Correctly
°
No Hot Water
Use only cold or room-temperature water during filtration.
×
No Colored Drinks
Do not use the filter for cola or other colored beverages.
T
Does Not Reduce TDS
This filter is not designed to reduce TDS values.
≈
Slower Flow
Filtration flow may be reduced by about 15–20%.
✓
Safe if Submerged
It is normal if the filter is submerged when the lower chamber is full.
3
Dry if Unused
If unused for over 3 days, remove filters and allow parts to dry.
!
No Detergents
Clean without detergents to help prevent clogging.
How It Works

How the Filter System Works

Water moves through the system by gravity. It first passes through the upper filter elements, then continues through the lower add-on filters before collecting in the lower chamber for dispensing.

1. Add Water to the Upper Chamber

Pour water into the top chamber. The system works without electricity, pressure, or plumbing.

2. Water Passes Through the Core Filters

Gravity pulls water downward through the upper filter elements as the first filtration step.

3. Add-On Filters Provide Extra Filtration

Water then continues through the lower add-on filters to support additional filtration performance.

4. Filtered Water Collects Below

Filtered water collects in the lower chamber and is ready to pour from the spigot when needed.

Filter Replacement

Filter Replacement Guide

Replacing filters on time helps your filtration system keep working properly. It also helps maintain water flow, drinking water taste, and everyday use confidence.

!
Track Usage Time & Filter Life

Filter life may vary by water quality, usage frequency, and total water volume filtered.

Rated Filter Life Reached

Replace the filters when they reach the rated lifespan listed for your filter model.

Water Flow Becomes Slower

If filtering takes much longer than usual, clean or replace the filters as needed.

Taste or Odor Returns

If unwanted taste or smell becomes noticeable again, it may be time to replace the filters.

Source Water Matters

Rain, river, stream, or well water may shorten filter life compared with regular tap water.

What to Check Before Replacing Filters
Confirm Compatibility

Choose filters that match your filtration system, filter series, and setup.

Prepare New Filters

Prime, rinse, or flush new filters according to the product instructions.

Check Seals & Washers

Make sure washers, seals, and threaded parts are installed correctly.

Clean the System

Empty and clean the upper and lower chambers before installing new filters.

Replace Sets Together

If your system uses paired filters, replace matching filters together when needed.

Record the Date

Write down the replacement date and set a reminder based on your usage.

Filter & System Replacement Checklist

Use this checklist to choose the right replacement filter for your Purewell system and check whether it may also fit select compatible systems from other brands.

Filter Category Filter Type Fits Purewell Systems Other Compatible Systems
K Series Carbon Filters (Pro) Core Filter SS Series and K Series filtration systems. Select ProOne Big+ / Big II and Berkey BB9-2 style systems.
K Series Carbon Filters Core Filter SS Series and K Series filtration systems. Select ProOne Big+ / Big II and Berkey BB9-2 style systems.
K Series Carbon Filters (Classic) Core Filter SS Series and K Series filtration systems. Black Berkey Elements style systems and select Berkey gravity systems.
K Series Ceramic Filters Core Filter SS Series and K Series filtration systems. Most gravity-fed systems from major brands, including Berkey, ProOne, Alexapure, Waterdrop, Doulton, Boroux, Culligan, and more.
SS Series Square Carbon Filters Core Filter SS Series and K Series filtration systems. Select ProOne Big+ / Big II and Berkey BB9-2 style systems.
SF Series Multi-Functional Filter Core Filter SF Series filtration systems. Select Zero pitchers and dispensers.
BO Series Unique Compound Filter Core Filter BO Series filtration systems only. Not intended for K Series, SS Series, or other gravity filtration systems.
K Series Specialty Add-On Filters Supplemental Filter Use together with K Series or SS Series core filters. Select Travel, Big, Royal, Imperial, Light, and Crown Berkey models as an additional filter option.
Filter replacement frequency directly affects the service cycle of your filtration system. Timely replacement helps support water flow, filtration performance, drinking water taste, and long-term system reliability. Actual filter life may vary based on source water quality, usage frequency, and total water volume filtered.
Shop Replacement Filters
Video

Specialty Add-On Filter Videos

Watch these quick video guides to prepare and install Purewell Specialty Add-On Filters correctly. Proper preparation and installation help support smoother setup and consistent daily use.

Installation Guide

Specialty Add-On Filter Installation

This video shows how to install Purewell Specialty Add-On Filters with a compatible gravity filtration setup. Follow the guide to help confirm the correct filter position before use.

Suitable for Specialty Add-On Filter setup Helps confirm the correct installation direction Recommended when adding or replacing add-on filters
Pre-Use Preparation

Clean Before Installation

This video explains how to clean or rinse Purewell Specialty Add-On Filters before installation. Preparing the filter before first use helps reduce loose particles and supports a cleaner setup process.

Recommended before first installation Helps prepare the filter for first use Useful for cleaner setup and daily performance

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  • 5 stars: 17 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
A.
It works

These come well packaged and wrapped in plastic. They work well and as expected. I screw them by threads to carbon filters. Water that comes out looks clean, and not dirty like stream/creek water so I can’t speak about the quality…but, they appear to work well.

K
K.T.
Fits perfectly

No issues, fits my carbon filter of stainless steel gravity systems.

B
B.P.
Fits my Berkey

This fits the Big Berkey and should fit the British Berkfeld and all of the clones available now.

R
R.J.
The water tastes great!

Well-made and fits my previous black carbon filter. The water tastes so much better after using these fluoride removal filters.

B
B.F.
Nice fluoride removal filter

These fit perfectly in our Big Berkey water filter and seem to be doing the job very well! I can't tell any difference between them and the more expensive versions. The water tastes great and these filters seem to function perfectly.

H
H.
I am happy!

It fit my black activated carbon water filters. I smelled the tank to check for mold or bad odors and did not smell anything. They function well and I am happy.

W
W.W.
Great product!

Great product a little pricey but good quality. Installation is easy. I use them in my purewell,water tastes great.

J
J.
I highly recommend them

These filters work just as well as the Berkey brand for a fraction of the cost.

J
J.D.
Quality

My tap water is very bad. Lots of fluoride so I’m happy to get a month out of these filters but the water that is filtered is very good. I’m sure the filter would last longer if the water wasn’t so mineralized

A
A.C.
Great filters

Works as described and is pretty quick filtering the water. Water has no taste, just water. And the dog loves it.

S
S.
Works great!

The filtered water is wonderful & has no odd taste or smell. I'm saving $$$ by not buying bottles & it's convenient to be attached to my black carbon filters. The filter looks nice! Would recommend

V
V.
GREAT WATER FILTER

Easy to be attached to carbon filter and does a great job...

M
M.
Great product

Great filters work as well as the much more expensive name brand ones.

H
H.
Good

Easy to install. Interesting design.

B
B.C.
Good!

Can be attached to my Purewell black carbon filter easily. Fits well!

W
W.
Love Purewell

They work great. Love my Purewell.

d
d.b.

Purewell - Fluoride Reduction Element PF-2

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