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 Softening Resin Cartridge 2.5" x 20" | USWF-2520-SF
2-1/2" x 20" Softening Cartridge For Hardness Reduction Ideal Cartridge to Install Pre-RO to Lower Hardness 2,500 Grains Capacity 1 GPM Design flow rate Fits Most 2.5” x 20” Filter Housings Temperature Range - 40°F (5°C) to 100°F (38°C) Pressure Range - 20 PSI...-
$51.59 - $30.95
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Topway Global TGI-WIN-445 Reverse Osmosis Filter Pack
Replacement Filter Pack for TGI Pure Model TGI-WIN-445 4-Stage 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 Technologies acquired...-
$93.25 - $55.95
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US Water Catalytic Carbon Filter Cartridge 2.5" x 20" | USWF-2520-CC
2.5" x 20" Catalytic Carbon Cartridge For Chloramine Removal (2.5" x 20") Utilizes FDA Grade Catalytic Carbon Removes or Reduces Chloramine Fits any standard or slimline 2.5" x 20" Housing Estimated capacity: 3,500 gallons Suggested flow - 2 gpm Packaged Individually 9 to a...-
$71.59 - $42.95
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Pure-Tel Ro-24 Reverse Osmosis Filters
PuROLine PL40T36PP Reverse Osmosis Filter Pack Replacement Filter Pack for PuROLine PL40T36PP 4-Stage Reverse Osmosis System All Filters are Made in the USA NSF Certified for PuROLine High Purity Reverse Osmosis Systems Fits PuROLine PL40T36PP Includes (1) 5 Micron Pre-Filter (1) Carbon Block Pre-Filters...-
$83.25 - $49.95
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AvantaPure Deluxe APPRO-50 Reverse Osmosis Filter Pack
AvantaPure Deluxe APPRO-50 Reverse Osmosis Filter Pack Replacement Filter Pack for AvantaPure Deluxe APPRO-50 5-Stage Reverse Osmosis System like the one pictured to the right All Filters are Made in the USA NSF Certified Includes (1) 5 Micron Pre-Filter (2) Carbon Block Pre-Filters (1)...-
$83.25 - $49.95
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Axeon 6 Stage Reverse Osmosis Filter Pack
Replacement Filter Pack for Axeon 6 Stage Reverse Osmosis Systems Axeon formerly named RO Ultra Tech has been in the water treatment marketplace over 30 years. US Water Systems offers quality USA manufactured compatible filters at a cost savings that will meet or exceed...-
$83.25 - $49.95
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Watts FMRO4 Reverse Osmosis Filters
Watts FMRO4 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,...-
$74.92 - $44.95
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US Water Fluoride Reduction Filter Cartridge 2.5" x 20" | USWF-2520-BC
US WATER SYSTEMS FLUORIDE REDUCTION FILTER CARTRIDGE 2.5" X 20" 2.5" x 20" Fluoride Removal (2.5" x 20")-US Water Systems USWF-2520-BC Fluoride can occur in drinking water naturally as a result of the geological composition of soils and bedrock. Additional fluoride enters drinking...-
$131.59 - $78.95
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Aqua-Pure LP Reverse Osmosis Filter Pack
Replacement Filter Pack for Aqua-Pure LP 4-Stage Reverse Osmosis System All Filters are Made in the USA NSF Certified for Aqua-Pure High Purity Reverse Osmosis Systems Fits LP Includes (1) 5 Micron Pre-Filter NSF 61 (AP110) (2) Carbon Block Pre-Filter NSF 42 (AP410RO) (1)...-
$74.92 - $44.95
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PuROLine PL40T36PP Reverse Osmosis Filters
PuROLine PL40T36PP Reverse Osmosis Filter Pack The PuROLine is Manufactured by Good Water Warehouse out of Fullerton CA. Replacement Filter Pack for PuROLine PL40T36PP 4-Stage Reverse Osmosis System All Filters are Made in the USA NSF Certified for PuROLine High Purity Reverse Osmosis Systems...-
$74.92 - $44.95
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Topway Global TGI-WIN-415 Reverse Osmosis Filter Pack | FP4-1
Replacement Filter Pack for TGI Pure Model TGI-415 4-Stage Reverse Osmosis System like the one pictured 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...-
$91.59 - $54.95
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Topway Global TGI-WIN-645UP Reverse Osmosis Filter Pack
Replacement Filter Pack for TGI Pure Model TGI-WIN-645UP 5-Stage 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 Technologies acquired...-
$99.92 - $59.95
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Axeon 4 Stage Reverse Osmosis Filter Pack- RF-4000
Replacement Filter Pack for Axeon 4 Stage Reverse Osmosis Systems - RF-4000 Axeon formerly named RO Ultra Tech has been in the water treatment marketplace over 30 years. US Water Systems offers quality USA manufactured compatible filters at a cost savings that will meet...-
$74.92 - $44.95
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Pure-Tel RO-10 CTA-5 Reverse Osmosis Filter Pack
R&M Manufacturing - Pure-Tel Replacement Filter Pack for Pure-Tel RO-10 CTA-5 3-Stage Reverse Osmosis System All Filters are Made in the USA NSF Certified for Pure-Tel High Purity Reverse Osmosis Systems Includes (1) 5 Micron Pre-Filter (Pure-Tel R1111, FLTR-1010) (1) Carbon Block Pre-Filter (Pure-Tel...-
$49.92 - $29.95
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LC100 And LC100P Reverse Osmosis Filters
LC100 And LC100P Reverse Osmosis Filter Pack US Water Systems offers quality USA manufactured compatible filters. Replacement Filter Pack that fits Hague® WaterMax® LC100 And LC100P 4-Stage 20" Sump Reverse Osmosis Systems All Filters are Made in the USA NSF Certified Replacements Includes (1)...-
$91.59 - $54.95
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US Water 4.5" x 30" Pleated Filter Cartridge 20 Micron - 222 Seal
4.5" x 30" 20 Micron US Water Polyester Filter Cartridge - 222 SealFeatures 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...-
$96.59 - $57.95
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3-Stage Q Series Replacement Filters For Well Water
The PuROTwist 4000 REVERSE OSMOSIS semi-permeable membrane rinses contaminants to the drain. High quality filtered drinking water is produced and conveniently stored in a sealed tank. The PuROTwist 4000 lead-free faucet easily delivers an abundant supply of clear, clean, and fresh drinking water to...-
$99.92 - $59.95
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US Water Nitrate Removal Filter Cartridge 2.5" x 20" | USWF-2520-NT
20" x 2.5" Nitrate Removal Cartridge Using Nitrate Selective Anion Resin Utilizes FDA Grade high capacity anion exchange resin Removes or Reduces Nitrate Fits any standard or slimline 2.5" x 20" Housing Removes Up To 12,927 mg/l (756 gpg) before replacement Suggested flow -...-
$134.92 - $80.95
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3-Stage Q Series Replacement Filters For City Water
The PuROTwist 4000 REVERSE OSMOSIS semi-permeable membrane rinses contaminants to the drain. High quality filtered drinking water is produced and conveniently stored in a sealed tank. The PuROTwist 4000 lead-free faucet easily delivers an abundant supply of clear, clean, and fresh drinking water to...-
$99.92 - $59.95
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US Water DI Resin Cartridge 2.5" x 20" .6 GPM | USWF-2520-MB-OR
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...-
$112.50 - $67.50
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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