Replacement Water Filters
Replacement Water Filters
Even the best water filter won’t help if the cartridge isn’t replaced on schedule. We make replacement cartridges to fit standard systems, from sediment and carbon to RO, fluoride and specialty media, most of them right here in the USA.
Shop by Filter Type
24 categories of cartridges, membranes and parts.

Reverse Osmosis Filters
Pre- and post-filters for under-sink RO
Shop Reverse Osmosis →
Reverse Osmosis Membranes
The heart of every RO system
Shop Reverse Osmosis Membranes →
Sediment Depth Filters
Spun polypropylene, 1 to 50 micron
Shop Sediment Depth →
Pleated Sediment Filters
Washable, high-capacity pleats
Shop Pleated Sediment →
Carbon Block & Granular Carbon Filters
Chlorine, taste, odor and VOCs
Shop Carbon Block & Granular Carbon →
Deionization (DI) Filters
Ultra-pure, spot-free water
Shop Deionization (DI) →
Calcite Remineralization Filters
Raise pH and add minerals back
Shop Calcite Remineralization →
In-Line Filters
Compact post-filters and fridge lines
Shop In-Line →
Disruptor & Interceptor
Pulsar Disruptor & Interceptor cartridges
Shop Disruptor & Interceptor →
Magna Filters
Cartridges for the Magna system
Shop Magna →
Enpress Filters
Enpress-compatible cartridges
Shop Enpress →
Limeblaster Filters
Scale prevention cartridges
Shop Limeblaster →
Chloramine Filters
Catalytic carbon for city water
Shop Chloramine →
Fluoride Filters
Fluoride reduction media
Shop Fluoride →
Nitrate Filters
Nitrate reduction media
Shop Nitrate →
Arsenic Filters
Arsenic reduction media
Shop Arsenic →
Polyphosphate Filters
Scale and corrosion control
Shop Polyphosphate →
Water Softening Filters
Softening resin cartridges
Shop Water Softening →
Foodservice Filters
Ice machines, coffee and fountain
Shop Foodservice →
Countertop Water Filters
No-install drinking water filters
Shop Countertop Water →
Undersink Drinking Water Filters
Point-of-use drinking water
Shop Undersink Drinking Water →
Empty Refillable Filters
Fill with any loose media
Shop Empty Refillable →
Harmsco Filters
Harmsco Hurricane cartridges
Shop Harmsco →
O-Rings Brackets & Wrenches
Housings, wrenches, O-rings
Shop O-Rings Brackets & Wrenches →
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US Water 2.5" x 9.75" Pleated Filter Cartridge 20 Micron
2.5" x 9.75" 20 Micron US Water Polypropylene Filter Cartridge Features Pleated design for more surface area Bacteria and chemical resistant Cleanable and reusable in most applications and micron sizes Thermally bonded end caps to ensure better sealing Benefits Lower overall operating cost Longer...-
$23.25 - $13.95
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US Water Systems Spun Poly Sediment Filter 2.5" x 10" 1 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 2.5" x 10" 1 Micron US Water Systems Dual-Gradient Sediment filter cartridges are robust, high efficiency polypropylene melt blown depth filters with an internal polypropylene core for added strength. These filters utilize a multi-layered construction...-
$11.59 - $6.95
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US Water Systems Sediment Depth Filter 2.5 x 9 5 Micron - Double O-Ring Seal
US Water Systems 5 Micron 2.5" x 9" Double O-Ring Seal Sediment Depth Filter US Water Systems sediment depth filters are made of bacteria resistant pure polypropylene and are ideal for both residential and commercial use as well as on city or well water....-
$24.92 - $14.95
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US Water Residential Membrane 75 GPD
US Water 75Gallon Per Day Premium Reverse Osmosis TFC Membrane 11.75" x 1.75" Standard Size RO Membrane Replaces the Following Membranes RO Ultratec Filmtec TW30-1812-75 Filmtec 93430 Filmtec 339140 Hague 200290 Desal TFM-75 Watts W-1812-75 Operating Limits Membrane Type: Thin Film Composite Maximum Operating...-
$53.33 - $32.00
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US Water Nitrate Removal Filter Cartridge 2.5" x 10" | USWF-2510-NT
10" x 2.5" Nitrate Removal Cartridge Using Nitrate Selective Anion Resin (9-3/4" x 2.5") Utilizes FDA Grade high capacity anion exchange resin Removes or Reduces Nitrate Fits any standard or slimline 2.5" x 10" Housing Removes Up To 5,711 mg/l ( 334 gpg) before...-
$69.92 - $41.95
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Great Tahoe Spring GTS-550-USA Reverse Osmosis Filters for Topway Global
Great Tahoe Spring Reverse Osmosis Filter Pack Topway Global, established in 1993, manufactured a wide variety of water softeners, point-of-entry filter units and point-of-use drinking water systems for residential, commercial, and industrial applications. In 2007 Watts Water Technologies acquired Topway Global. US Water Systems...-
$99.92 - $59.95
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US Water Quantum Disinfection IQ 1.0 Replacement Filter Cartridge
US Water Quantum Disinfection™10 GPM Replacement Filter Cartridge Genuine replacement cartridge for Quantum Disinfection™ Premium System and Standard Quantum Disinfection™System using 2.5” x 10” Cartridge. Any microorganism that comes into direct contact with the surface of the disinfection media is immediately and completely destroyed....-
$665.00 - $399.00
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US Water Systems Carbon Block Filter 2.5 x 9 Double O-Ring Seal
US Water Systems Carbon Block Filter 2.5 inch x 9 inch - 10 Micron Double O-Ring Seal Filter Filter elements are designed to fit US Water Systems 10” double o-ring seal filter housings. This high quality carbon block media is manufactured from raw materials...-
$33.25 - $19.95
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Big Blue White Refillable Filter Canister 4.5" x 20"
4.5" X 20" Big Blue White Empty Refillable Canister for Granular Media Can be used with a wide range of media, including carbon, polyphosphate, calcite, resin and other media. Low cost and reusable. Made with FDA approved food grade polypropylene. Includes foam pad. Volume...-
$29.92 - $17.95
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5-Stage USA Made Arsenic Reverse Osmosis Filter Pack | FP5A-USA
Our 5-Stage Filter Pack includes silicone to ensure a proper seal and extend the life of the o-rings, helping maintain optimal system performance. Fits Most Sump-Type Filters Using 2-1/2"x9.75" (10") Housings, Including the Following Models: Watts FMRO5G Watts FMRO5J Watts Manifold 5-Stage All Flowmatic...-
$183.25 - $109.95
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US Water Galaxy 4-Stage Filter Pack
US Water Galaxy 4-Stage Filter Pack This is a direct replacement for the US Water Galaxy 4-Stage reverse osmosis system. We recommend changing out your filters every 6-12 months and the membrane every 3-5 years. If you have adequate pre-filtration, such as a water...-
$66.59 - $39.95
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US Water Systems Chloramine Carbon Block Filter 2.5 x 9 Double O-Ring Seal
US Water Systems Chloramine Carbon Block Filter 2.5 inch x 9 Inch Double O-Ring Seal - 1 Micron Filter Filter elements are designed to fit US Water Systems 10” double o-ring seal filter housings. This high quality carbon block media is manufactured from raw...-
$41.59 - $24.95
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Watts W-525 Reverse Osmosis Filters
Watts W-525 Reverse Osmosis Filter Pack Watts Water Technologies, Inc. is a supplier of products and solutions that manage and conserve the flow of fluids and energy into, through and out of buildings in the residential and commercial markets. The Company, through its subsidiary,...-
$99.92 - $59.95
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US Water Arsenic Reduction Cartridge 2.5" x 10" | USWF-2510-AR
US Water Arsenic Reduction Cartridge The USWF Series 10" x 2.5" Arsenic Reduction Filter provides effective Arsenic reduction by utilizing the advanced media technology of ResinTech's ASM-10-HP Arsenic Selective Media which has unsurpassed capacity and is effective over the entire pH range of potable...-
$149.92 - $89.95
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US Water Systems 4.5 x 10 Carbon Block Filter With Double O-Ring Seal
US Water Systems 4.5 x 10 Carbon Block Filter With Double O-Ring Seal Filter elements are designed to fit US Water Systems 10” big gray filter housings. Double O-Ring seal prevents filter bypass and ensures that 100% of your water is filtered This high...-
$64.92 - $38.95
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Pulsar Quantum Disinfection System - 10 GPM
The Pulsar Quantum Disinfection System™ is a true eco-friendly, carbon neutral water disinfection solution. This system utilizes patented technology, which harnesses the quantum mechanic principles of electron movement to create surface catalytic sites that strip away viruses, bacteria, and pathogens. This system does not...-
$831.67 - $499.00
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US Water 2.5" x 20" Pleated Filter Cartridge 1 Micron
2.5" x 20" 1 Micron US Water Polypropylene Filter CartridgeFeatures Pleated design for more surface area Bacteria and chemical resistant Thermally bonded end caps to ensure better sealing Benefits Lower overall operating cost Longer filter runs for fewer change outs Lower initial pressure drops...-
$24.92 - $14.95
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US Water Big Blue Softening Resin Cartridge 4.5" x 20" | USWF-4520-SF
4.5" x 20" Big Blue Replacement Softening Cartridge For Hardness Reduction Ideal Cartridge to Install Pre-RO to Lower Hardness 6,200 Grains Capacity 3 GPM Design flow rate Fits Most 4.5” x 20” Big Blue Filter Housings Temperature Range - 40°F (5°C) to 100°F (38°C)...-
$91.59 - $54.95
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Omnipure Filter Q5633 Series
The Omnipure Q5633 Q-Series Replacement Cartridge is a 10 GAC (Granular Activated Carbon) filter used to reduce or remove chlorine, chloramines and chemicals in your water. This filter fits Omnipure Twist Tap filter heads QNVH B, C, or J, with or without automatic shutoff....-
$33.25 - $19.95
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Omnipure Filter Q5605 Series
The Omnipure Q5605 Q-Series Replacement Cartridge is a 5 micron sediment filter used to reduce dirt and sand in your water. This filter fits Omnipure Twist Tap filter heads QNVH B, C, or J, with or without automatic shutoff. The Q-Series is ideal for...-
$33.25 - $19.95
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How to Choose a Replacement Filter
Know these three things and you’ll get the right cartridge the first time.
Your Housing Size
Most housings take 2.5″ or 4.5″ wide cartridges in 10″ or 20″ lengths. Measure your old filter or check the manual.
Your Water Problem
Sediment, chlorine, fluoride and scale each need a different media. Not sure? See our water problems guide.
Your Micron Rating
Lower microns catch smaller particles but slow flow and need changing more often.
Replacement Water Filter Cartridge Sizes
How to measure: unscrew the housing, pull the old cartridge, and measure across the top for width and down the side for length. Larger commercial sizes are also available, and in-line filters don’t need a housing at all.
Mark Timmons, the Water Doctor, shows how to size a water filter.
Filter Cartridge Options
Spun Polypropylene Sediment →
Sand, silt and rust, 1 to 50 micron
Pleated Sediment →
Washable, high capacity for well water
Granular Activated Carbon (GAC) →
High flow chlorine, taste and odor
Carbon Block →
Finer filtration for drinking water and VOCs
Bone Char →
Fluoride and heavy metal reduction
Calcite →
Raises pH and adds minerals back
Micron Ratings, Explained
A micron is one millionth of a meter. A human hair is about 90 microns wide. Sediment filters are rated from 50 microns down to 0.35 or smaller.
Can’t Find Your Cartridge?
Send us the size, brand or a photo of your old filter and a certified specialist will match it.
Call 1-855-508-9561