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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5-Stage USA Made Standard Reverse Osmosis Filter Pack | FP5-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...-
$116.59 - $69.95
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US Water 4.5" x 20" Pleated Filter Cartridge 5 Micron
4.5" x 20" 5 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...-
$44.92 - $26.95
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US Water Systems American Made (All-American) 5-stage R/O Filter Pack
Our 5-Stage Filter Pack is for the US Water Systems American Made 5 stage reverse osmosis system and includes silicone to ensure a proper seal and extend the life of the o-rings, helping maintain optimal system performance.Fits the US Water Systems American Made 5...-
$158.25 - $94.95
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US Water 4.5" x 20" Pleated Filter Cartridge 20 Micron
4.5" x 20" 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...-
$44.92 - $26.95
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10" Carbon Block Filter Cartridge - Made in USA - Universal Fit
US Water Carbon Block Filter 2.5 inch x 10 inch - 10 Micron Filter NSF/ANSI 42 Certified to reduce chlorine, taste, odor, and sediment Standard sizing. Designed to fit most 10” filter housings. Made in the US. This filter element is rated at 10...-
$18.25 - $11.99
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US Water 4.5" x 20" Pleated Filter Cartridge 1 Micron
4.5" x 20" 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...-
$44.92 - $26.95
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US Water 4.5 x 20 Carbon Block Filter | USWCB-4520-10
US Water Carbon Block Filter 4.5 inch x 20 inch - 10 Micron Filter Filter elements are designed to fit most 20” big blue style filter housings. This high quality carbon block media is manufactured from raw materials to precise specifications entirely in a...-
$88.25 - $54.99
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US Water Systems Radial Flow Carbon Filter 4.5" x 20" | RFC-BB-20
US Water Systems 4.5" x 20" 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...-
$199.92 - $119.95
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Cobalt Hyper-Safe 5-Stage Reverse Osmosis Filter Pack | FP5-CHS
US Water Cobalt Hyper-Safe Reverse Osmosis Filter PackReplacement Filter Pack for US Water Cobalt Hyper-Safe 5-Stage Reverse Osmosis System. All Filters are Made in the USA NSF Certified Includes (1) Carbon Block (1) Chloramine Carbon Block (1) Bone Char Cartridge (1) 1/4" NPT...-
$183.25 - $109.95
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US WATER SYSTEMS RESIDENTIAL MEMBRANE 50 GPD
50 GPD RO Membrane Replacement - 1812 Fit | US Water 50 GPD RO Membrane Replacement Drop-in fit for any standard 1812 housing Confirmed fit for APEC (ROES-50), iSpring (RCC7), Watts, Pentair, Express Water, GE, and more — specs with test conditions published upfront,...-
$65.93 - $39.56
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US Water 4.5" x 20" Pleated Filter Cartridge 0.5 Micron
4.5" x 20" 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...-
$58.25 - $34.95
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US Water 4.5" x 9.75" Pleated Filter Cartridge 5 Micron
4.5" x 9.75" 5 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
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Limeblaster 4.5" x 20" Replacement Cartridge | 222 Seal
4.5" x 20" US Water Limeblaster Cartridge - 222 Seal Features Pleated design for more surface area Reduces scale and prevents build-up. Bacteria and chemical resistant Thermally bonded end caps to ensure better sealing Benefits Completely safe for drinking water Easy to fit and...-
$133.25 - $79.95
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US Water Systems Spun Poly Sediment Filter 2.5" x 10" 5 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 2.5" 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...-
$11.59 - $6.95
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US Water Systems American Made (All-American) 6-stage R/O Filter Pack
Our 6-Stage Filter Pack is for the US Water Systems American Made 6 stage reverse osmosis system and includes silicone to ensure a proper seal and extend the life of the o-rings, helping maintain optimal system performance. Fits the US Water Systems American Made...-
$416.59 - $249.95
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US Water Systems Radial Flow Carbon Filter 4.5" x 20" | Double O-Ring Seal
US Water Systems Radial Flow Carbon Filter 4.5" x 20" | Double O-Ring 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 Media...-
$216.59 - $129.95
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US Water 4.5 x 10 Carbon Block Filter | USWCB-4510-10
US Water Carbon Block Filter 4.5 inch x 10 inch - 10 Micron Filter Filter elements are designed to fit most standard 10” big blue style filter housings. This high quality carbon block media is manufactured from raw materials to precise specifications entirely in...-
$48.25 - $28.95
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US Water DI Resin Cartridge 2.5" x 10" .3 GPM | USWF-2510-MB
US Water .3 GPM 2.5" x 10" 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. Cartridges with mixed...-
$56.75 - $34.05
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US Water DI Resin Cartridge 4.5" x 20" 1.5 GPM | USWF-4520-MB
US Water 1.5 GPM 4.5" x 20" 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. Cartridges with mixed...-
$224.92 - $134.95
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US Water Pulsar Quantum Disinfection & GAC Cartridge for RO Systems
US Water Pulsar™ Quantum Disinfection™ & GAC Filter for Reverse Osmosis Systems The polishing filter on your RO is a carbon filter. What if it were a carbon filter that killed bacteria too? That's a game changer! This turns any Reverse Osmosis System into...-
$83.25 - $49.95
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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