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BO Series Unique Compound Filter

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Filtration Stages: 6-Stage Multifunctional Filter

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Product Details
Product Type Core Filter
Filtration Options 6-Stage / 9-Stage
Compatibility Only for Purewell BO Series Filter Systems
Package Quantity 1 Box / 2 Filters
Filter Life Up to 6,000 Gallons per Box
Flow Rate Approx. 2.38 Gallons per Hour with 2 Filters Installed
Series BO Series
Filter Size Approx. 3.15 in × 6.42 in / Φ8 × 16.3 cm
Important Compatibility Not compatible with other filter system types.
Filtration Options & Item Numbers

6-Stage Multifunctional Filter

Item No. K8001
Filter Material
  • Mesh Layer
  • PP Cotton
  • Activated Carbon
  • KDF Layer
  • Silver Ion
  • Hollow Fiber UF Membrane
Key Functions
0.01 μm Pore Size Removes Bacteria Reduces Chlorine Reduces Heavy Metals
Performance Details
Filter Life Up to 6,000 Gallons per Box
Flow Rate Approx. 2.38 Gallons per Hour with 2 Filters Installed
Filter Size Approx. 3.15 in × 6.42 in / Φ8 × 16.3 cm
Box Weight Approx. 1.76 lb Net / 1.87 lb Gross

9-Stage Multifunctional Fluoride Reduce

Item No. K8006
Filter Material
  • First Mesh Layer
  • First PP Cotton
  • Fluoride Reduction Material
  • Second PP Cotton
  • Second Mesh Layer
  • Activated Carbon
  • KDF Layer
  • Silver Ion
  • Hollow Fiber UF Membrane
Key Functions
0.01 μm Pore Size Removes Bacteria Reduces Chlorine Reduces Heavy Metals Reduces Fluoride
Performance Details
Filter Life Up to 6,000 Gallons per Box
Flow Rate Approx. 2.38 Gallons per Hour with 2 Filters Installed
Filter Size Approx. 3.15 in × 6.42 in / Φ8 × 16.3 cm
Box Weight Approx. 1.76 lb Net / 1.87 lb Gross
Use Notes
01

Choose 6-Stage Multifunctional Filter for BO Series daily filtration with bacteria removal, chlorine reduction, and heavy metal reduction.

02

Choose 9-Stage Multifunctional Fluoride Reduce if you want added fluoride reduction in addition to multifunctional filtration.

03

Designed only for Purewell BO Series filter systems and not intended for K Series, SS Series, or other gravity systems.

04

Each box includes 2 filters. Install both filters together for the listed flow rate and rated filter life.

05

Flush filters before first use according to the product instructions.

06

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

Note: This filter is only compatible with Purewell BO Series filter systems. It is not designed for K Series, SS Series, third-party gravity systems, sink faucets, pressurized plumbing, or other filter system types. Filter life and flow rate may vary depending on source water quality, usage frequency, and maintenance conditions.
User Guide
Compound Filter Guide

How to Use the Compound Filter

Follow these simple steps to prime, install, and use the compound filter correctly with compatible Purewell systems.

Step 01

Prime the Compound Filter

Before installation, remove the round lid and filter washer from the top of the compound filter, then rinse the filter under running water.

1
Remove the round lid and filter washer from the top of the compound filter.
2
Attach the inlet of the compound filter to the faucet outlet and rinse for at least 120 seconds or until the water runs clear.
Tip: Priming helps flush loose particles before the compound filter is installed.
Visual Guide Remove Lid → Rinse
Remove the round lid and filter washer from the top.
Attach to the faucet outlet and rinse for at least 120 seconds.
Step 02

Install the Compound Filters

Insert the compound filter and filter washer through the installation hole, then secure the filter with the remaining washer and round lid.

1
Insert the compound filter’s threaded rod with the filter washer into the hole from the exterior side of the chamber.
2
Place the remaining filter washer and round lid in sequence to secure the compound filter’s stud.
3
Check that each compound filter is installed securely before use.
Note: Make sure the filter is stable and sealed, but do not overtighten the parts.
Visual Guide Insert → Secure → Ready
Insert the compound filters through the lower chamber holes.
Secure the filters with the washer and round lid.
Installation is complete when both filters are secure.
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. 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 cannot reduce the TDS value of water.
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 filtration 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
Does Not Reduce TDS
This filter is not designed to reduce TDS values.
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 flows downward through the filter elements by gravity. After passing through the filters, the filtered water collects in the lower chamber and is ready to dispense.

1. Fill the Upper Chamber

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

2. Gravity Pulls Water Through the Filters

Water naturally moves downward through the filter elements, where the filtration process takes place.

3. Filtered Water Collects Below

Once filtered, the water collects in the lower chamber, ready to use whenever you need it.

4. Dispense When Needed

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

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

Compound Filter Installation Video

Watch this quick guide to install your Purewell Compound Filter correctly. Proper installation helps support stable water flow and reliable daily filtration performance.

Installation Guide

Compound Filter Setup

This video shows how to install the Purewell Compound 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 Compound Filter

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  • 5 stars: 41 (93%)
  • 4 stars: 3 (7%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
e
e.t.
The best investment I have made

The hose taste is gone the water has no smell no bleach from city water and no more floride. The filter last so long I couldn't believe it.thank you so easy to install..

G
G.
Filters sit in the water just filtered

The product is well made. The reason I only gave it a four star rating is because I don’t like that the filters sits in the lower chamber in with the water just filtered.

V
V.B.D.
Great little water filter

This is a lovely piece of necessary equipment to have. I truly dislike that water and this makes tap water beautiful. Nice job! I definitely recommend

J
J.D.
Water quality/ taste great

Love my pure well, the water tastes great, the only downside is the water gauge/ window is very hard to see the water level

V
V.
Bon rapport qualité prix

Bon rapport qualité prix, j'en suis contente

R
R.D.
Great customer service!!

Great customer service. We bought the Purewell 6 stage 0.01 ultra-filtration gravity water filter system November-2024. We didn’t use it til July-2025. The filters must’ve been bad cause it didn’t filter the water. Water was terrible. I emailed the company and they responded within 24 hrs. They sent us new filters . It works great! Highly recommend!!!

C
C.d.
Méfiez-vous des imitations

Méfiez-vous des imitations. Je l'avais commandé à plusieurs reprises avant de trouver celui-là. Il n'y a pas de doute, il est beaucoup mieux que le modèle avec la jauge de niveau extérieure au-dessus du robinet. Il ne fuit pas et le robinet reste bien en place. Les cuves sont mieux ajustées.
La filtration fait son effet l'eau est parfaitement limpide sa saveur est neutre.
Conservée au réfrigérateur elle est très désaltérante, c'est un plaisir à chaque gorgée.
Bye bye les bouteilles de plastique !

M
M.
It does the job

Very happy with the purchase. Works well and water tastes great

S
S.S.
Fresh Clean Water

So my friend has a Berkey water filter.I wasn't impressed with the price ( very expensive ) I said self there has to be something equivalent to it ,that's when I came across the Purewell.It is awesome.I just upgraded to this one that has the water level window.
No more plastic water bottles to pollute the environment,plus I live upstairs and such a pain to drag the water upstairs.
Get this Ultra-Filtration Gravity Water Filter System ,the best purchase I have ever made.Highly recommend.

k
k.
Works great

Works great and provides filtered water. Fairly quick results after filling the top. Only drawback is the learning curve in knowing how much to add so it doesn’t overflow.

A
A.
Produit de bonne manufacture et fonctionnel. Attention normes NSF/ANSI 42&372 non-mentionnées.

Emballage soigné. Produit de bonne qualité. À voir sur le long terme. Notice floue sur le montage des cartouches entre elles (nécessité de consulter des vidéos de concurrents). Attention emballages et notices qui ne mentionnent aucune normes relative à la filtration. On ne sait donc pas si le produit est NSF/ANSI 42&372 à l’instar de ses autres concurrents (Joypur…). Après recherche et en l’absence d’info, j’en doute même si le site Internet semble le mentionner par des images peu développées. Le système fonctionne correctement. Temps de filtration respectable. Débit au robinet correct.

R
R.B.
Great water filers

These work perfectly!

H
H.V.
EXCELLENT PRODUIT

FAIT LE JOB COMME DEMANDE ET PROPREMENT ET BIEN. QUALITE, FACILE ET? MALHEUREUSEMENT UTILE DE NOS JOURS :-)

W
W.
Water so much better than tap!

Doesn’t leak, water is delicious

S
S.R.
Availability and customer service

Love them always a pleasure doing business with you

V
V.
5 étoiles

Impeccable après 6 mois d'utilisation. Je recommande!

K
K.W.
Perfect

This item arrived timely and exactly as described. Very pleased.

k
k.
Good product

Love it

L
L.K.
Works as expected.

Works as expected.

T
T.
Great Water Filter, but a little too easy to make a mess.

This Water Filter makes great filtered water. It's easy to set up, and it's size makes it perfect to put anywhere on your counter. The water tastes great after filtering. Functionally, it works as intended.

The only hang up to this system is that it is real easy to have a watery mess on your hands by overfilling it. There's nothing between the two chambers to prevent water from spilling out. It has happened to me a few times. The best advice I can give is to make sure the bottom chamber is completely empty before filling the top chamber.

Beyond this, it's a great water filter.

B
B.C.
Works well, but seems to use proprietary filters.

This system works well to filter most public water sources to a "clean" drinking levels. We have a chlorine issue where I live and this filter system takes care of the problem with ease. Assembly was straight forward and I appreciate the stacking design for when the system needs to be stored. The built-in sight glass is a bonus for me.

The only issue I have is the proprietary filters. This system cannot use the standard filters usually found in comparable products. This could lead to a supply chain and/or obsolescence issue if you don't have a stash of filters on hand. You can readily get similar performing filters for the "other" system at around half the cost, so I don't see the value benefit of this particular system. Having said that, it does work, so I can't bash on it for that.

A
A.
Great filter system

So far, I am thrilled with this filter! I have a few filter setups like this, and I really love them. I got this one to use in our RV. This is easy to assemble and use. It came with everything I need - included the stand! The water tastes great using this filter. It doesn’t leak or drip. It seems to be very well constructed. Having a filter system like this is a must have for an RV, or for anywhere you want to make sure your water is clean and safe.

L
L.H.
Best choice by far in this price range!

I researched quite a few water filters and this was an easy winner.

D
D.W.
Great filters they work

Filters do work. I still have to test fluoride and chlorine levels. But i do know it takes the PpM from 218 out of the faucet at first to .01 ppm after a few weeks i did notice it slightly increased to .19. Which is no big deal. The water taste fantastic. Well worth the money.

R
R.
MUST BUY

I have been wanted to drink a plenty of good water, so I've decided to buy this. I was actually looking at the other ones like this, however I think I've purchased the best one out of the rest after all..! The filters are way but easy to install and easy to build, easy to use, beautiful to have it at kitchen..! I'd definitely recommend 👌 1000%

D
D.M.
Pureté de l eau

La véracité des instructions au sujet de la pureté de l eau filtrée, la confiance, donc.

N
N.P.
The purewell 10 stage filter has no equal! Only 11 parts per million

1. Versus other filters: The only other similar results in a filter I have found is in the Zero brand filter. However, the Zero water filters burn out in a few days (I live in AZ).

Every other type of filter does almost nothing in this state (AZ has hard water) including sink, gravity, and expensive Berkey filters.

2. It’s better than some reverse osmosis systems: I spent good money on a countertop RO system; it takes way too long to filter, and the ppm is about the same. Only an expensive high-end RO system would be better.

3. The cons: I don’t know how long the filter will last (I just got it). You need to add minerals (right now, my water is at only 11 PPM).

M
M.
Great Water filter

I bought this product continuously and recommending to my family and friends. Since it is doing a wonderful job in filtering the clorine water. The water taste is completely good like a canned water. Value for money

L
L.B.
Love it

Filters fast, tastes great. It does leak when overfilled but that was easily fixed.

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