Keep your filtered water at its best
Every filter works by trapping the bad stuff, which means every cartridge slowly fills up and eventually needs replacing. This page is for anyone who already owns a filter system and wants to keep it performing like new, without the guesswork. The two things that matter are matching the cartridge to your housing size (10 inch or 20 inch, Slimline or the fatter Big Blue) and changing it on time.
Best for: Existing filter system owners · Routine 3-6 month filter changes · Restoring taste and flow · DIY maintenance
Which one is yours?
You own an undersink reverse osmosis system
The RO Filter Set (incl Membrane) replaces all five stages, membrane included, in one order, and it fits standard 1812-size systems. See it
You own the 5-Stage Ultra-Filter system
The 5 Stage Ultra Filter Replacement Set gives you every cartridge plus the 0.2-micron (nominal) membrane in a single kit. Between membrane changes, the 4-filter pre-filter set covers the six-monthly swap. See it
You only need the sediment stage on a whole-house filter
A melt blown cartridge is the affordable routine choice; pick the pleated version if you would rather wash and reuse it between changes. See it
Your water still tastes or smells of chlorine
A carbon block cartridge is the fix for taste and smell; step up to the Premium GAC/KDF cartridge if odours or metals persist. See it
Not sure which system you own? Match it from a photo and get its exact refills.
The range
10-inch Melt-Blown Sediment, 5 µm10 inch Melt Blown Sediment Filter - 5 Micron10-inch Slimline5 µm (nominal)SedimentThe everyday workhorse sediment cartridge: layered polypropylene with no glues or binders traps rust, sand and dirt down to a nominal 5 microns. Fits all standard 10-inch Slimline housings, and the same design comes in other micron ratings and sizes.Best for: Routine sediment changesView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
10-inch Pleated Sediment, 5 µm10 inch Pleated Sediment Water Filter Replacement Cartridge - 5 Micron10-inch5 µm (nominal)WashableThe folded polyester design packs in far more surface area, so it holds more dirt, lasts longer and keeps water pressure steady. The media is washable, which stretches its working life further.Best for: Dirtier water, longer lifeView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
10-inch Carbon Block10 inch Carbon Block Water Filter Replacement Cartridge10-inchCarbon block5 µm (nominal)Dense activated carbon absorbs the chlorine and organic compounds that make tap water taste and smell off, and its nominal 5-micron rating catches fine particles too. Fits all standard 10-inch housings.Best for: Chlorine taste and smellView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
10-inch GAC/KDF Cartridge10 inch Premium GAC/KDF Filter Replacement Cartridge10-inchGAC + KDF mediaTwo filter medias in one cartridge: granular activated carbon for chlorine, taste and odour, plus KDF media that targets heavy metals and hydrogen sulphide. Built for up to six months of use in standard 10-inch housings.Best for: Stubborn odours and metalsView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
10-inch Basic Pre-Filter Set10inch Basic Pre-Filter Replacement Set3 cartridges10-inchFor basic 3-stage systemsThree filters in one kit, covering the sediment and carbon stages that do the heavy lifting in a basic 10-inch system. Removes sediment, chlorine and chemical tastes while protecting the filters downstream.Best for: Basic 10-inch 3-stage systemsView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
RO Filter Set, with membraneRO Filter Set (incl Membrane)Full set incl. membraneFits 1812-size RO systemsEverything a standard undersink reverse osmosis system needs in one box: sediment, GAC and carbon block stages, a taste-polishing inline filter and a 75GPD membrane. Fits 1812-size RO systems with standard 10-inch slimline housings.Best for: Undersink RO system ownersView at our store(opens The Water Filter Factory in a new tab)
5-Stage Ultra Set, with membrane5 Stage Ultra Filter Replacement Filter Set (including Membrane)Full set incl. UF membraneFor the 5-Stage Ultra-FilterA complete refresh for the 5-Stage Ultra-Filter system, including the 0.2-micron (nominal) UF membrane designed to reduce bacteria, parasites and microplastics. A simple DIY replacement compatible with most 10-inch slimline ultra-filter systems.Best for: 5-Stage Ultra-Filter ownersView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
5-Stage Ultra / RO Pre-Filter SetUnder Counter RO and 5 Stage Ultra Water Filter System Replacement Filter set (excl Membrane)4 filters, no membraneFor 5-Stage Ultra or RO systemsA complete four-filter replacement set (sediment, GAC, carbon block and inline taste-and-odour) that keeps your 5-Stage Ultra-Filter or under-counter RO system delivering clean, great-tasting water. The membrane is not included.Best for: Keeping a 5-stage system at its bestView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
20-inch Slimline Set20 inch Water Filter Cartridge Replacement Set - Sediment, Carbon, GAC20-inch SlimlineSediment, carbon, GACA full three-stage refill for 20-inch Slimline whole-house systems: fine sediment removal, a carbon block for chlorine, and a final taste-polishing GAC stage. Fits all 20 x 2.5 inch Slimline housings, with a Big Blue version also available.Best for: Whole-house Slimline systemsView at our store(opens The Water Filter Factory in a new tab)Spec sheet (PDF)
Quick fixes
One-minute answers to the problems owners ask about most, taken from real customer reviews.
Worth knowing before you buy
Cartridges only fit housings of the same format — check whether yours takes 10 inch or 20 inch cartridges, and whether it is a standard Slimline (2.5 inch diameter) or the fatter Big Blue, before you order. Most cartridge types here are available in all four combinations.
Sediment cartridges come in micron ratings from 1 to 50 — a lower number catches finer particles. If you are unsure, 5 micron is the standard rating used across SUPERPURE systems.
A replacement cartridge restores your existing system; it will not add capability the system never had. Sediment filters do not improve taste, and carbon filters do not reduce dissolved solids — that is the job of an RO membrane.
Keeping it running
Replace each cartridge at its stated time or litre limit, whichever comes first. As a rule of thumb from the product specifications, that's every 3 to 6 months for sediment and carbon cartridges, and 12 to 24 months for RO and ultra-filter membranes, depending on your water quality.
Register your filter and we’ll remind you when it’s due, with the exact replacement linked. Set it up once
Ready when you are
Buy at our store or your favourite marketplace: same product, same support, same promise.