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SF Series Multi-Functional Filter

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Filtration Stages: 8-Stage Alkaline Filter

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Product Details
Product Type Core Filter
Filtration Options 7-Stage / 8-Stage
Compatibility Purewell SF Series Filter Systems
Package Quantity 1 Box / 2 Filters
Filter Life Up to 100–1,000 Gallons per Filter
Flow Rate Depends on Water Pressure
Series SF Series
Filter Size Approx. 3.94 in × 7.48 in / Φ10 × 19 cm
Also Compatible With Zero Pitchers and Dispensers
Filtration Options & Item Numbers

7-Stage TDS Reducer Filter

Item No. K8023
Filter Material
  • Mesh Layer
  • PP Cotton
  • Activated Carbon
  • Silver Ion
  • PP Cotton
  • TDS Reduction Material
  • PP Cotton
Key Functions
Reduces Chlorine Reduces Heavy Metals Reduces TDS
Performance Details
Filter Life Up to 100 Gallons per Filter
Flow Rate Depends on Water Pressure
Filter Size Approx. 3.94 in × 7.48 in / Φ10 × 19 cm
Box Weight Approx. 2.65 lb Net / 3.09 lb Gross

8-Stage Alkaline Filter

Item No. K8022
Filter Material
  • Mesh Layer
  • PP Cotton
  • Activated Carbon
  • Silver Ion
  • KDF Layer
  • PP Cotton
  • Alkaline Material
  • PP Cotton
Key Functions
Reduces Chlorine Reduces Heavy Metals Raises pH Level
Performance Details
Filter Life Up to 1,000 Gallons per Filter
Flow Rate Depends on Water Pressure
Filter Size Approx. 3.94 in × 7.48 in / Φ10 × 19 cm
Box Weight Approx. 2.65 lb Net / 3.09 lb Gross

8-Stage Reduce Fluoride Filter

Item No. K8021
Filter Material
  • Mesh Layer
  • PP Cotton
  • Activated Carbon
  • Silver Ion
  • KDF Layer
  • PP Cotton
  • Fluoride Reduction Material
  • PP Cotton
Key Functions
Reduces Chlorine Reduces Heavy Metals Reduces Fluoride
Performance Details
Filter Life Up to 1,000 Gallons per Filter
Flow Rate Depends on Water Pressure
Filter Size Approx. 3.94 in × 7.48 in / Φ10 × 19 cm
Box Weight Approx. 2.43 lb Net / 2.87 lb Gross
Use Notes
01

Choose 7-Stage TDS Reducer Filter if you want a filter option designed to reduce TDS, chlorine, and heavy metals.

02

Choose 8-Stage Alkaline Filter if you want filtration with an added alkaline material layer designed to raise pH level.

03

Choose 8-Stage Fluoride Removal Filter if you want added fluoride reduction in addition to chlorine and heavy metal reduction.

04

Designed for Purewell SF Series filter systems and also compatible with Zero pitchers and dispensers.

05

Each box includes 2 filters. Filter life is listed per individual filter and may vary by water quality and usage.

06

Flush filters before first use and replace them when the rated capacity is reached or water flow becomes noticeably slower.

Note: Filter life and flow rate may vary depending on source water quality, water pressure, usage frequency, and maintenance conditions. Always check your pitcher or dispenser model and filter size before purchase. Third-party brand names are used for compatibility reference only.
User Guide
Multi-Functional Filter Guide

How to Install and Prime the Multi-Functional Filter

Follow these simple steps to install, pre-filter, and use the multi-functional filter correctly with compatible Purewell and ZeroWater pitcher or dispenser systems.

Step 01

Install the Multi-Functional Filter

Insert the multi-functional filter into the hole from the exterior side of the upper chamber, then rotate the lid to secure the filter in place.

1
Insert the multi-functional filter into the installation hole from the exterior side of the upper chamber.
2
Place the lid on the filter stud and rotate it until the multi-functional filter is secure.
3
Check that the filter is stable and properly seated before adding water.
Tip: The filter should be secure, but do not overtighten the lid.
Visual Guide Insert → Place Lid → Rotate
Place the lid and prepare the filter for installation.
Insert the filter from the exterior side of the chamber.
Rotate the lid until the filter is secured in place.
Step 02

Prime the Filter After Installation

Fill the upper chamber with water and allow it to filter into the lower chamber. Discard the first batch of filtered water before normal use.

1
Fill the upper chamber with as much water as possible and wait for the water to filter into the lower chamber.
2
Discard the first batch of filtered water to complete the pre-filtration process.
3
Refill the upper chamber to enjoy normal filtered water.
Note: The SF-04 filter can be used directly without pre-filtration.
Visual Guide Fill → Filter → Discard First Batch
Fill the upper chamber and allow water to filter down.
Discard the first batch, then refill for normal use.
Step 03

Important Notice

Follow these care tips to ensure proper use and avoid clogging, poor flow, or compatibility issues.

1
This filter is only compatible with specific Purewell water filtration systems and ZeroWater pitcher and dispenser. Please ensure compatibility before use.
2
Do not use the filter to filter hot water.
3
This filter cannot remove color from beverages such as cola.
4
This filter does not reduce the TDS value of water, except for the SF-04 filter, which is designed to reduce TDS.
5
When the lower chamber is full, the filter may be submerged. This is normal and safe for use.
6
For optimal performance, continue using the filter once activated. It is not suitable for storage after initial use.
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
Check Compatibility
Use only with compatible Purewell or ZeroWater pitcher and dispenser systems.
°
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
TDS Note
This filter does not reduce TDS, except for the SF-04 filter.
Safe if Submerged
It is normal if the filter is submerged when the lower chamber is full.
Keep in Use
Once activated, keep the filter in continuous use for best performance.
!
No Detergents
Clean without detergents to help prevent clogging.
How It Works

How the Filter System Works

Water is added to the upper chamber and moves through the center filter by gravity. After filtration, water collects in the lower chamber and is ready to dispense from the spigot.

1. Fill the Upper Chamber

Add water to the top chamber. The system works without electricity, plumbing, or pressure.

2. Gravity Moves Water Through the Filter

Water naturally flows downward through the center filter element, where the filtration process takes place.

3. Filtered Water Collects Below

After passing through the filter, water collects in the lower chamber for storage and daily use.

4. Dispense When Needed

Open the spigot to pour filtered water for drinking, cooking, or everyday hydration.

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.
Video

Multi-Functional Filter Installation Video

Watch this quick guide to install your Purewell Multi-Functional Filter correctly. Proper installation helps support stable water flow, reliable filtration performance, and easier daily use.

Installation Guide

Multi-Functional Filter Setup

This video shows how to install the Purewell Multi-Functional Filter with a compatible filtration system. Follow the guide before first use or when replacing an old filter.

Recommended before first use Helps confirm the correct filter position Useful when installing or replacing the Multi-Functional Filter

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  • 5 stars: 10 (83%)
  • 4 stars: 2 (17%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
D
D.H.
Fits perfectly

These fit my Purewell system perfectly. So far, work very well. I do recommend these if you are looking for replacement filters with thread.

C
C.
Superior Filters

Fit was perfect... it only had to match the diameter & thread of the holes after all.

M
M.
Nice filter

No noticeable difference in quality or functionality with other brands. I would buy more of this brand. Nothing bad to report.

A
A.C.
Decent Filter, Good Price

I would be happy to buy two sets of these instead of one set of name brand filters, as the two sets will last longer. If your looking for a good deal on water filters that work, these are worth looking at.

F
F.G.
Greay for daily use

I got three of these and I love the simple design. They're easy to use. The water tastes great out of this. I'm happy with it.

B
B.
Good replacements for my new system.

I recommend this Purewell replacement filter set. Remind: you need to confirm if this filter with thread fits your system or not.

D
D.K.
work great

These work great at filtering out pretty much everything. They are a little pricey, but in the bigger picture worth it for your health and for your waters taste.

W
W.
These are great.

These filters are exactly described and pictured by the vendor.

Fits in almost all gravity type filters except the very small ones.
The difference between water from the tap and water that has been filtered by these filters is like night and day. Virtually no comparison.
These filters remove almost everything nasty and smelly. They don't just improve the taste, they remove over 200+ contaminants like chlorine, heavy metals - and more.
I have been using filters very similar to these for decades and wouldn't be without them. Tap water is a no go for me. The filtered water from these is great for cooking too.
It's hard to explain how good there really are. You need to experience it for yourself.

I 100% recommend getting and using these. Great deal and a good value.

M
M.
Good filtters

They do the trick well.

C
C.S.
Perfect fit for our Purewell Gravity Water Filter System

I requested the Purewell Water Filter Replacement for Gravity Water Filter System for use with our Purewell Gravity Water Filter System. These filters fit perfectly and are a breeze to swap out. I find them a little pricey but otherwise, they are perfect!

A
A.C.
Does the job

They are great quality and work just as needed. Came just as described, 2 in a pack. Very happy with this purchase.

D
D.
Quality construction

I'm using these filters for a DIY water filter system. Easy to install.

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