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.
NOT SURE WHICH FILTER FITS?1-855-508-9561Call a Water Specialist
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 →
-
US Water 10 Inch Inline Carbon Filter
US Water 10 Inch In-line Granular Activated Carbon Filter Customers can rely upon this simple but dependable inline carbon filter for a variety of used including ice machines, water coolers, drinking fountains, as was as under-the-sink applications and as components in reverse osmosis systems....-
$24.92 - $14.95
- Unit price
- per
-
-
US Water Lead & Cyst Carbon Block Filter | USWCB-2510-LD
US Water Lead & Cyst Carbon Block Filter 2.5 inch x 10 inch - 0.5 Micron Filter Filter elements are designed to fit most standard 10” filter housings. This high quality carbon block media is manufactured from raw materials to precise specifications entirely in...-
$33.25 - $19.95
- Unit price
- per
-
-
H3500 Reverse Osmosis Filters
H3500 Reverse Osmosis Filter Pack US Water Systems offers quality USA manufactured compatible filters. Replacement Filter Pack that fits Hague® H3500 4-Stage Reverse Osmosis System All Filters are Made in the USA NSF Certified Replacements Includes (1) 5 Micron Pre-Filter (1) Carbon Block Pre-Filters...-
$74.92 - $44.95
- Unit price
- per
-
-
US Water 4.5 x 20 Carbon Block Filter Double O-Ring Seal | USWCB-4520-10-222
US Water Carbon Block Filter 4.5 inch x 20 inch - 10 Micron Filter With Double O-Ring Seal Filter elements are designed to fit US Water 4.5" x 20” Gray filter housings. This high quality carbon block media is manufactured from raw materials to...-
$119.09 - $71.45
- Unit price
- per
-
-
US Water 2.5 x 20 Carbon Block Filter | USWCB-2520-10
US Water Carbon Block Filter 2.5 inch x 20 inch - 10 Micron Filter Filter elements are designed to fit most standard 20” filter housings. This high quality carbon block media is manufactured from raw materials to precise specifications entirely in a US manufacturing...-
$33.25 - $19.95
- Unit price
- per
-
-
US Water Calcite Remineralization Cartridge - 2.5" x 9.75" | USWF-2510-PH
US Water Calcite Cartridge to Re-Mineralize Reverse Osmosis Water and Raise pH - 2.5” x 10 The US Water re-mineralization cartridge dissolves calcium carbonate into the water, which adds essential minerals for good taste and health and neutralizes the pH. This filter generally increases...-
$28.25 - $16.95
- Unit price
- per
-
-
US Water 2.5" x 9.75" Pleated Filter Cartridge 5 Micron
2.5" x 9.75" 5 Micron US Water Polypropylene Filter CartridgeFeatures 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 filter...-
$23.25 - $13.95
- Unit price
- per
-
-
US Water Chloramine Carbon Block Filter | USWCB-2510-CL
US Water Chloramine Carbon Block Filter 2.5 inch x 10 inch - 1 Micron Filter Filter elements are designed to fit most standard 10” filter housings. This high quality carbon block media is manufactured from raw materials to precise specifications entirely in a US...-
$58.25 - $34.95
- Unit price
- per
-
-
US Water Residential Membrane 35 GPD
US Water 35 Gallon Per Day Premium Reverse Osmosis TFC Membrane 11.75" x 1.75" 35 GPD Standard Size RO Membrane Works up to 25% longer than standard membranes with better rejection. Axeon has been making membranes for over twenty years and with their advanced...-
$84.92 - $50.95
- Unit price
- per
-
-
US Water Systems Spun Poly Sediment Filter 4.5" x 10" 5 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 4.5" x 10" 5 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...-
$29.92 - $17.95
- Unit price
- per
-
-
US Water 4.5" x 9.75" Pleated Filter Cartridge 20 Micron
4.5" x 9.75" 20 Micron US Water Polyester Filter CartridgeFeatures 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 filter...-
$33.25 - $19.95
- Unit price
- per
-
-
US Water DI Resin Cartridge 2.5" x 20" .6 GPM | USWF-2520-MB
Perfect for laboratories, reefkeeping and rinsing or plating operations Deionization cartridges provide solutions for a variety of applications that need the removal of ionic contaminants. Cartridges with mixed bed resins provide better than 16 megohm-cm quality water for ultra pure needs. Features & Benefits...-
$96.59 - $57.95
- Unit price
- per
-
-
US Water Galaxy Standard 5-Stage Filter Pack
US Water Galaxy 5-Stage Filter Pack This is a direct replacement for the US Water Galaxy 5-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...-
$116.59 - $69.95
- Unit price
- per
-
-
Limeblaster 4.5" x 10" Replacement Cartridge | 222 Seal
4.5" x 10" US Water Limeblaster Cartridge - 222 Seal Features Pleated design for more surface area Bacteria and chemical resistant Thermally bonded end caps to ensure better sealing Benefits Completely safe for drinking water Easy to fit and low maintenance No electricity needed...-
$91.59 - $54.95
- Unit price
- per
-
-
US Water Systems Spun Poly Sediment Filter 4.5" x 20" 5 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 4.5" x 20" 5 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...-
$58.25 - $34.95
- Unit price
- per
-
-
US Water Pulsar Quantum Disinfection Cartridge for RO Systems
US Water Pulsar Quantum Disinfection Filter For Reverse Osmosis Systems This is a game changer! This works on any Reverse Osmosis System, as it contains Quantum Disinfection Media which kills all bacteria on contact. Quantum Disinfection Media is a chemical-free, power-free, maintenance-free, and extremely...-
$74.92 - $44.95
- Unit price
- per
-
-
Waterlogix Residential Reverse Osmosis Membrane - 100 GPD
The Highest Quality Membranes in the Industry - Replaces FILMTEC, DESAL, WATTS and Most Other Brand Membranes. This is a Thin-Film Composite Membrane Using the Latest Thin Film Technology with 95-99% Rejection when new. At US WATER, we believe this is the best 100...-
$58.33 - $35.00
- Unit price
- per
-
-
5-Stage USA Made Quantum Disinfection Reverse Osmosis Filter Pack | FP5S-USA
5-Stage Made in USA Filter Pack With Quantum Disinfection Cartridge Turns Any RO System into a Purifier! Our 5-Stage Filter Pack includes silicone to lubricate the O-Rings and the Quantum Disinfection Cartridge so that you can trust your water to be as clean as...-
$158.25 - $94.95
- Unit price
- per
-
-
Made in USA 4-Stage Reverse Osmosis Filter Pack
Our 4-Stage Filter Pack includes silicone to lubricate the O-Rings so that you can trust you water to be as clean as it can be. Fits Most Sump-Type Filters Using 2-1/2" x 9.75" (10") Housings, Including the Following Models Watts FMRO4G Watts FMRO4J All...-
$99.92 - $59.95
- Unit price
- per
-
-
US Water Systems Spun Poly Sediment Filter 2.5" x 20" 5 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 2.5" x 20" 5 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...-
$21.59 - $12.95
- Unit price
- per
-
How to Choose a Replacement Filter
Know these three things and you’ll get the right cartridge the first time.
1
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.
2
Your Water Problem
Sediment, chlorine, fluoride and scale each need a different media. Not sure? See our water problems guide.
3
Your Micron Rating
Lower microns catch smaller particles but slow flow and need changing more often.
Replacement Water Filter Cartridge Sizes
2.5″ x 10″SLIM
2.5″ x 20″SLIM
4.5″ x 10″BIG BLUE
4.5″ x 20″BIG BLUE
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.
50 µ sand20 µ10 µ pollen5 µ silt1 µ cysts0.5 µ bacteria
FinerCoarser
Lower micron numberCatches smaller particles, but water flows slower and the cartridge fills up sooner.
Tip: stage itPut a coarse 20 to 50 micron filter first and a fine 1 to 5 micron filter after, so the fine one lasts longer.
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