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 →
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US Water Big Blue Calcite Replacement Cartridge 4.5" x 20" | USWF-4520-PH
4.5" x 20" Calcite cartridge is used to neutralize acidic water (raising the pH), reducing the leaching of metal plumbing components, and for use post RO to raise TDS, in case the plumbing is copper and leaching of the copper is an issue. Capacity:...-
$116.59 - $69.95
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US Water 4.5" x 20" Pleated Filter Cartridge 50 Micron
4.5" x 20" 50 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...-
$41.59 - $24.95
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US Water Systems Livation Hydration In-line Alkaline Filter With 1/4" Quick Connect Fittings
US Water Systems Livation Hydration In-line Alkaline Filter With 1/4" Quick Connect Fittings ⚠️ Replacing an existing Livation filter? If you bought an American Made Reverse Osmosis System before December 2025, you'll need the Livation Retrofit Installation Kit to install this filter. Why: the...-
$249.92 - $149.95
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US Water DI Resin Cartridge 4.5" x 20" Double O-Ring Seal 1.5 GPM | USWF-4520-MB-OR
US Water 1.5 GPM 4.5" x 20" Double O-Ring Seal Replacement Ultra High Purity DI Cartridge For TDS Reduction 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....- $149.95
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US Water 4.5" x 9.75" Pleated Filter Cartridge 1 Micron
4.5" x 9.75" 1 Micron US Water Polyester 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...-
$41.59 - $24.95
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6-Stage Aquapurion Filter Pack with Remineralization
6-Stage Reverse Osmosis Filter Pack With Remineralization Filter | FP6 Includes (1) 5 Micron Pre-Filter - US Water (2) Carbon Block Pre-Filters - US Water (1) Remineralization Cartridge - Hydronix (1) In-Line GAC Post-Filter - US Water (1) Silicone Packet Detailed Instructions On-Line Video...-
$133.25 - $79.95
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US Water 2.5" x 9.75" Pleated Filter Cartridge 1 Micron
2.5" x 9.75" 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 2.5" x 20" Pleated Filter Cartridge 5 Micron
2.5" x 20" 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...-
$36.59 - $21.95
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US Water 2.5" x 9.75" Pleated Filter Cartridge 0.5 Micron
2.5" x 9.75" 0.5 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...-
$41.59 - $24.95
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US Water Systems Maverick R/O Filter Pack
USA-MADE FILTER PACK FOR MAVERICK RO SYSTEMSThis filter pack contains all the filters needed for any of the US Water Systems Maverick-Series Reverse Osmosis Systems, including the following models: 220-MAV-200 220-MAV-350 220-MAV-500 220-MAV-750 It also includes silicone to ensure a proper seal and extend...-
$299.92 - $179.95
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US Water Residential Membrane 25 GPD
US Water 25 Gallon Per Day Premium Reverse Osmosis TFC Membrane11.75" x 1.75" 25 GPD Standard Size RO MembraneWorks up to 25% longer than standard membranes with better rejection. Axeon has been making membranes for over twenty years and with their advanced thim film...-
$83.25 - $49.95
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US Water Systems Radial Flow Carbon Filter 4.5" x 10" | RFC-BB-10
US Water Systems 4.5" x 10" Radial Flow Carbon Filter - Now Made in America The US Water Radial Flow Carbon Cartridge is a uniquely designed granular activated (GAC) carbon cartridge with an outside poly shell and an inner core which holds the GAC...-
$133.25 - $79.95
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4.5 x 20 Limeblaster Replacement Cartridge | LBC-4520-D
4.5" x 20" US Water Limeblaster Cartridge - DOE 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...-
$66.59 - $39.95
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US Water Fluoride Reduction Filter Cartridge 2.5" x 10" | USWF-2510-BC
US WATER SYSTEMS FLUORIDE REDUCTION FILTER CARTRIDGE 2.5" X 10" 2.5" x 10" Fluoride Removal (2.5" x 9-3/4")-US Water Systems USWF-2510-BC Fluoride can occur in drinking water naturally as a result of the geological composition of soils and bedrock. Additional fluoride enters drinking...-
$64.92 - $38.95
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US Water Systems Radial Flow Carbon Filter 4.5" x 10" | Double O-Ring Seal
US Water Systems 4.5" x 10" Radial Flow Carbon Filter - Double O-Ring Positive Seal The US Water Radial Flow Carbon Cartridge is a uniquely designed granular activated (GAC) carbon cartridge with an outside poly shell and an inner core which holds the GAC...-
$149.92 - $89.95
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US Water Systems Spun Poly Sediment Filter 4.5" x 20" 1 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 4.5" x 20" 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...-
$58.25 - $34.95
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US Water System 10 Inch Inline Granular Activated Carbon Filter With Black Body
US Water System 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...-
$24.92 - $14.95
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H3000 Reverse Osmosis Filter Pack
H3000 Reverse Osmosis Filter Pack US Water Systems offers quality USA manufactured compatible filters. Replacement Filter Pack that fits Hague® WaterMax® H3000 5-Stage Reverse Osmosis System All Filters are Made in the USA NSF Certified Replacements Includes (1) 5 Micron Pre-Filter (2) Carbon Block...-
$99.92 - $59.95
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US Water Chloramine Carbon Block Filter | USWCB-4520-CL
US Water Chloramine Carbon Block Filter 4.5 inch x 20 inch - 1 Micron Filter Filter elements are designed to fit most standard 20” big blue style filter housings. This high quality carbon block media is manufactured from raw materials to precise specifications entirely...-
$233.25 - $139.95
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US Water 4.5" x 9.75" Pleated Filter Cartridge 0.5 Micron
4.5" x 9.75" 0.5 Micron US Water Polyester 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...-
$41.59 - $24.95
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How to Choose a Replacement Filter
Know these three things and you’ll get the right cartridge the first time.
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