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K-serie speciale add-on filters

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Voeg gerichte filtratie toe aan uw zwaartekrachtwatersysteem met speciale K Series add-on filters. Kies een 5-traps optie voor extra fluoridereductie of een 3-traps alkalische optie ontworpen om de pH-waarde te verhogen. Deze aanvullende filters moeten worden gecombineerd met compatibele Purewell K Series- of SS Series-kernfilters. Elke doos bevat twee filters.

Ask about K-serie speciale add-on filters

Product Details
Producttype Aanvullend filter
Filtratieopties 5-traps / 3-traps
Vereiste koppeling Kernfilter
Pakkethoveelheid 1 doos / 2 extra filters
Filterlevensduur Tot 200–1.000 gallon per doos
Debiet Hangt af van kernfilterdoorstroming en waterdruk
Serie K Series
Filtermaat Ca. 2,76 in × 6,30 in / Φ7 × 16 cm
Belangrijk gebruik Alleen als extra filter. Niet bedoeld voor gebruik als enige filter.
Filtratieopties & artikelnummers

5-traps fluoridereductie

Artikelnr. K8003
Filtermateriaal
  • Eerste PP-watten
  • Actieve kool
  • Tweede PP-watten
  • Materiaal voor fluoridereductie
  • Derde PP-watten
Belangrijkste functies
Vermindert chloor Vermindert fluoride Extra filtratie
Prestatiegegevens
Filterlevensduur Tot 1.000 gallon per doos
Doosgewicht Ongeveer 1,39 lb netto / 1,52 lb bruto

3-traps alkalisch filter

Artikelnr. K8002
Filtermateriaal
  • Eerste PP-watten
  • Alkalisch materiaal
  • Tweede PP-watten
Belangrijkste functies
Verhoogt het PH-niveau Extra filtratie
Prestatiegegevens
Filterlevensduur Tot 200 gallons per doos
Doosgewicht Ongeveer 1,39 lb netto / 1,52 lb bruto
Gebruiksaanwijzingen
01

Dit is een aanvullend filter en moet samen met compatibele K Series- of SS Series-kernfilters worden gebruikt.

02

Kies 5-traps fluoridereductie als u extra fluoridereductie wilt na de kernfilterfase.

03

Kies het 3-traps alkalische filter als u een extra laag alkalisch materiaal wilt die is ontworpen om het PH-niveau te verhogen.

04

Werkt ook met de Berkey-modellen Travel, Big, Royal, Imperial, Light en Crown als extra zwaartekrachtfilter-optie.

05

Draai niet te strak aan tijdens de installatie. Zorg ervoor dat het aanvullende filter stevig aan de kernfiltersteel is bevestigd.

06

Vervang de aanvullende filters wanneer de nominale capaciteit is bereikt of wanneer de waterstroom merkbaar langzamer wordt.

Opmerking: dit product is een aanvullend supplementair filter en is niet ontworpen om het hoofdfilter op zichzelf te vervangen. De levensduur van het filter en het debiet kunnen variëren afhankelijk van de bronwaterkwaliteit, waterdruk, de conditie van het kernfilter, gebruiksfrequentie en onderhoudsomstandigheden. Merk- en modelnamen van derden worden uitsluitend als compatibiliteitsreferentie gebruikt.
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.
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

NSF Certified for Your Health

Independently tested to meet NSF/ANSI 42 & 372 standards, the highest level of trust in water filtration.

Lead-Free Guarantee (NSF/ANSI 372)
Certified lead-free materials to keep your water worry-free.

You Also Like

These add-on filters effectively remove fluoride and improve water taste when attached to carbon filters. Customers said "water tastes great" and praised the "great value." However, some reported compatibility issues with certain systems, particularly threading problems that prevented proper installation. Filters work well with gravity systems.

  • The filtered water is wonderful & has no odd taste or smell. I'm saving money by not buying bottles
  • Well-made and fits my previous black carbon filter. The water tastes so much better
Quality (positive)Taste (positive)Installation (positive)Filters (positive)Fluoride (positive)
  • 5 stars: 17 (94%)
  • 4 stars: 1 (6%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
Andrew
Almost perfect

Great filters. Pity that I couldn't make a yearly subscription!

A
Anonymous
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.
Fits perfectly

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

B
Bruce
Fits my Berkey

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

R
Roy
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
Bloominghen
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
Hugs777
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
William
Great product!

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

J
Jeff
I highly recommend them

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

J
Judy
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
Amazon
Great filters

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

S
Shelly
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
Vicky
GREAT WATER FILTER

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

M
Mandy
Great product

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

H
Hody
Good

Easy to install. Interesting design.

B
B.
Good!

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

W
William
Love Purewell

They work great. Love my Purewell.

d
deanna

Purewell - Fluoride Reduction Element PF-2

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