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 2.5" x 20" Pleated Filter Cartridge 0.5 Micron
2.5" 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...-
$41.59 - $24.95
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US Water Polyphosphate Filter Cartridge 2.5" x 10" | USWF-2510-PP
US Water 2.5" x 10" Phosphate Cartridge The cartridges contain food grade slow melt polyphosphate that dissolves slowly in water to inhibit scale and rust build-up. This type of treatment is recommended for use with ice machines, coffee and vending machines, food service equipment,...-
$83.25 - $49.95
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Topway Global TGI-525 5-Stage Reverse Osmosis Filter Pack
Replacement Filter Pack for TGI Pure Model TGI-525 or Watts W-525 Reverse Osmosis System 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...-
$99.92 - $59.95
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US Water Systems Calcite Replacement Cartridge 4.5" x 10" With Double O-Ring Seal
US Water Systems Big Blue Calcite Replacement Cartridge 4.5" x 10" With Double O-Ring Seal 4.5" x 10" 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,...-
$96.59 - $57.95
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5-Stage Reverse Osmosis Filter Pack with Remineralization Filter | FP5PH
5-Stage Reverse Osmosis Filter Pack With Remineralization Filter | FP6 Includes (1) 5 Micron Pre-Filter - US Water (1) Carbon Block Pre-Filters - US Water (1) Remineralization Cartridge - US Water (1) 1/4" NPT In-Line GAC Post-Filter - US Water (1) Silicone Packet Detailed...-
$91.59 - $54.95
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5-Stage Reverse Osmosis Filter Pack with Fluoride Filter | FP5F
5-Stage Reverse Osmosis Filter Pack With Fluoride Removal Cartridge Fits Most 5-Stage Reverse Osmosis Systems Fits Most 5-Stage Reverse Osmosis Systems Includes 5 Micron Pre-Filter Carbon Block Pre-Filter Fluoride Removal Filter 1/4" NPT In-line GAC carbon post filter (1) Silicone Packet Detailed Instructions All...-
$116.59 - $69.95
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US Water 4.5 x 20 Chloramine Carbon Block Filter Double O-Ring Seal | USWCB-4520-CL-OR
US Water Systems Chloramine Carbon Block Filter 4.5 Inch x 20 Inch Double O-Ring Seal - 1 Micron Filter Filter elements are designed to fit US Water Systems 20” double o-ring style filter housings. This high quality carbon block media is manufactured from raw...-
$249.92 - $149.95
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American Plumber WRO-4500 Reverse Osmosis Filter Pack
Replacement Filter Pack for American Plumber WRO-4500 Reverse Osmosis System All Filters are Made in the USA NSF Certified Includes (1) 5 Micron Pre-Filter (555021-52) (1) Carbon Block Pre-Filter (555021-52) (1) 1/4" NPT In-Line GAC Post-Filter (255521-51) (1) Silicone Packet Membrane Sold Separately It...-
$74.92 - $44.95
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Vertex Pure Water Machine PT-4.0/5 Reverse Osmosis Filter Pack FK-101
Replacement Filter Pack for Vertex Pure Water Machine PT-4.0/5 Reverse Osmosis Systems Vertex Water Products is a family owned company since 1998. US Water Systems offers quality USA manufactured compatible filters at a cost savings that will meet or exceed Vertex Water Products specifications....-
$99.92 - $59.95
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PuROLine Reverse Osmosis Filters
PuROLine PL-5000, PL-4000, PL50T50, PL50T75, PL50T100, and PL40T50 Reverse Osmosis Filter Pack The PuROLine is Manufactured by Good Water Warehouse. US Water Systems offers quality USA manufactured compatible filters at a cost savings that will meet or exceed Good Water Warehouse specifications. Replacement Filter...-
$91.59 - $54.95
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Clear Refillable Filter Canister 2.5" x 10" | RC-C-975
2.5" X 10" (9.75") Clear Empty Refillable Canister for Granular Media - Ideal for Color-Changing DI Resin 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...-
$16.58 - $9.95
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4-Stage USA Made Quantum Disinfection Reverse Osmosis Filter Pack | FP4S-USA
4-Stage Made in USA Filter Pack With Quantum Disinfection Cartridge Turns Any RO System into a Purifier! Our 4-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...-
$108.25 - $64.95
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US Water Softening Resin Cartridge 2.5" x 9.75" | USWF-2510-
2.5" x 9.75" Softening Cartridge For Hardness Reduction Ideal Cartridge to Install Pre-RO to Lower Hardness 1,100 Grains Capacity 1 GPM Design flow rate Fits Most 2.5” x 9.75” Filter Housings Temperature Range - 40°F (5°C) to 100°F (38°C) Pressure Range - 20 PSI...-
$33.25 - $19.95
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US Water DI Resin Cartridge 4.5" x 10" Double O-Ring Seal 0.8 GPM | USWF-4510-MB-OR
US Water 0.8 GPM 4.5" x 10" Double O-Ring Seal Replacement Ultra High Purity DI Cartridge For TDS ReductionPerfect for laboratories, reefkeeping and rinsing or plating operationsDeionization cartridges provide solutions for a variety of applications that need the removal of ionic contaminants. Cartridges with...-
$116.59 - $69.95
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US Water Nitrate Removal Filter Cartridge 4.5" x 20" | USWF-4520-NT
4.5" x 20" Nitrate Removal Cartridge Using Nitrate Selective Anion Resin Utilizes FDA Grade high capacity anion exchange resin Removes or Reduces Nitrate Soft water feed is recommended Fits any standard big blue 4.5" x 20" Housing Removes Up To 31,994 mg/l ( 1,871...-
$304.92 - $182.95
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Big Blue White Refillable Filter Canister 4.5" x 10" | RC-W-BB-975
4.5" X 9.75" (10") 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....-
$21.30 - $13.15
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US Water Fluoride Reduction Filter Cartridge 4.5" x 20" | USWF-4520-BC
US WATER SYSTEMS FLUORIDE REDUCTION FILTER CARTRIDGE 4.5" X 20" 4.5" x 20" Fluoride Removal (4.5" x 20")-US Water Systems USWF-4520-BCFluoride can occur in drinking water naturally as a result of the geological composition of soils and bedrock. Additional fluoride enters drinking water in discharge...-
$288.25 - $172.95
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Watts 4 Stage Manifold Reverse Osmosis PWRO4 Filter Pack
There are lots of filter companies selling Reverse Osmosis filters, but if you look closely, you'll find that nearly all of them are made in Taiwan or China. While it is not always possible to sell everything that is American-Made, this 4-Stage Reverse Osmosis...-
$74.92 - $44.95
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US Water Big Blue Polyphosphate Filter Cartridge 4.5" x 10" | USWF-4510-PP
US Water 4.5" x 10" Phosphate Cartridge The cartridges contain food grade slow melt polyphosphate that dissolves slowly in water to inhibit scale and rust build-up. This type of treatment is recommended for use with ice machines, coffee and vending machines, food service equipment,...-
$149.92 - $89.95
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4-Stage Reverse Osmosis Filter Pack Fits Most Sump-Type RO Systems - 20"
US Water 4-Stage Permeate Pump Reverse Osmosis Filter Pack For Systems With 20" Filters All Filters are NSF Certified for High Purity Reverse Osmosis Systems Includes: (1) 5 Micron Pre-Filter (2) Carbon Block Pre-Filters Membrane Sold Separately It is recommended that filters be changed...-
$91.59 - $54.95
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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