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 Systems Calcite Replacement Cartridge 4.5" x 20" Double O-Ring Seal | USWF-4520-PH-OR
US Water Systems Calcite Replacement Cartridge 4.5" x 20" Double O-Ring Seal | USWF-4520-PH-OR 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...-
$183.25 - $109.95
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4.5 x 10 Limeblaster Replacement Cartridge | LBC-4510-D
4.5" x 10" US Water Limeblaster Replacement Cartridge The Limeblaster Foodservice Replacement Cartridge prevents scale formation in any water using appliance, water heating device or downstream equipment, to improve efficiency and prolong the life. The Limeblaster media prevents scale by transforming dissolved hardness minerals...-
$41.59 - $24.95
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US Water Systems Spun Poly Sediment Filter 4.5" x 10" 1 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 4.5" x 10" 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...-
$29.92 - $17.95
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US Water 2.5" x 20" Pleated Filter Cartridge 20 Micron
2.5" x 20" 20 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...-
$24.92 - $14.95
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Omnipure Filter Q5621 Series
The Omnipure Q5621 Q-Series Replacement Cartridge is a 10 carbon block filter used to reduce or remove chlorine, chloramines and chemicals in your water. This filter fits Omnipure Twist Tap filter heads QNVH B, C, or J, with or without automatic shutoff. The Q-Series...-
$49.92 - $29.95
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US Water 4.5" x 9.75" Pleated Filter Cartridge 50 Micron
4.5" x 9.75" 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...-
$33.25 - $19.95
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Watts GTS-550 Reverse Osmosis Filters
Watts GTS-550 Reverse Osmosis Filter Pack US Water Systems offers quality USA manufactured compatible filters at a cost savings that will meet or exceed Watts Water Technologies specifications. Replacement Filter Pack for Watts GTS-550 5-Stage Reverse Osmosis System All Filters are Made in the...-
$83.25 - $49.95
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5-Stage USA Made Nitrate Reverse Osmosis Filter Pack | FP5N-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...-
$129.92 - $77.95
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US Water Calcite Replacement Cartridge 2.5" x 20" | USWF-2520-PH
2.5" x 20" Calcite cartridge to neutralize acidic water, reduce leaching of metal plumbing components, and for use post RO to raise TDS. Capacity: 10,000 Gallons Flow Rate: 2.0 GPM-
$43.25 - $25.95
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US Water Systems Spun Poly Sediment Filter 4.5" x 20" 20 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 4.5" x 20" 20 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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Vertex Pure Water Machine PT-4.0 Reverse Osmosis Filter Pack - FK-100
Replacement Filter Pack for Vertex Pure Water Machine PT-4.0 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....-
$66.59 - $39.95
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US Water Systems Spun Poly Sediment Filter 2.5" x 10" 20 Micron
US Water Systems Meltblown Spun Poly Sediment Filter - 2.5" x 10" 20 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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APEC RO-45, RO-90, RO-Perm, And RO-Pump Reverse Osmosis Filters
APEC Reverse Osmosis Filter Pack US Water Systems offers quality USA manufactured compatible filters at a cost savings that will meet or exceed APEC specifications. Replacement Filter Pack for APEC RO-45, RO-90, RO-Perm, and RO-Pump 5-Stage Reverse Osmosis System like the one pictured to...-
$99.92 - $59.95
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US Water Big Blue Polyphosphate Filter Cartridge 4.5" x 20" | USWF-4520-PP
US Water 4.5" x 20" 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,...-
$154.92 - $92.95
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5-Stage USA Made Chloramine Reverse Osmosis Filter Pack | FP5C-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. All Filters are NSF Certified for High Purity Reverse Osmosis Systems and are Made in the U.S.A. Includes (1) 5 Micron...-
$91.59 - $54.95
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H2000 And H2500 Reverse Osmosis Filter Pack
Replacement Filter Pack for 3-Stage Reverse Osmosis System US Water Systems offers quality USA manufactured compatible filters All Filters are Made in the USA NSF Certified Replacements Includes (1) 5 Micron Pre-Filter (1) Carbon Block Pre-Filter Silicone Packet Membrane Sold Separately It is recommended...-
$49.92 - $29.95
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Topway Global TGI-WIN-545P Reverse Osmosis Filter Pack | 201-FP5-2
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...-
$99.92 - $59.95
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US Water Systems Galaxy2 5-Stage Filter Pack With Quantum Disinfection
US Water Galaxy 5-Stage Filter Pack This is a direct replacement for the US Water Galaxy 5-Stage reverse osmosis system with Quantum Disinfection. We recommend changing out your filters every 6-12 months and the membrane every 3-5 years. If you have adequate pre-filtration, such...-
$124.92 - $74.95
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Omnipure 3/8" QC GAC Replacement Filter | K2533KK
The Omnipure K-Series is a replacement filter body with3/8" Quick-Connect fittings incorporated into the design. The Omnipure K-Series K2533-KK inline filter features 3/8" Quick-Connect compression fittings that allow for installation and replacement in a matter of seconds without the use of tools. The Omnipure...-
$41.59 - $24.95
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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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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