Replacement Water Filters
Even the best water filter won't do you any good if you don't replace the filter cartridge regularly. At US Water Systems, we have a wide range of replacement water filter cartridges to fit all types of standard systems. Whether you need a carbon filter, a sediment filter, or filter to remove fluoride from your water, we've got a great selection, most of which are made right here in the USA. If you aren't sure what type of replacement water filters you need or if a specific filter cartridge will fit your system, call our friendly Certified Water Specialists at 1-800-608-8792, and we'll be happy to help!
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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...- $59.95
$90.91- $59.95
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US Water Systems Chloramine Carbon Block Filter 2.5 x 9 Double O-Ring Seal
US Water Systems Chloramine Carbon Block Filter 2.5 inch x 9 Inch Double O-Ring Seal - 1 Micron Filter Filter elements are designed to fit US Water Systems 10” double o-ring seal filter housings. This high quality carbon block media is manufactured from raw...- $24.95
$45.41- $24.95
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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...- $49.95
$90.91- $49.95
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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...- $14.95
$27.21- $14.95
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US Water Systems Livation Hydration In-line Alkaline Filter With 1/4" FPT
US Water Systems Livation Hydration In-line Alkaline Filter With 1/4" FPT At US Water Systems, we understand that the basic crux of our being is water. We know that water is life and strive to evolve the traditional health model into a more proactive...- $149.95
$272.91- $149.95
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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...- $59.95
$90.91- $59.95
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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...- $6.95
$12.65- $6.95
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US Water 2.5" x 9.75" Pleated Filter Cartridge 10 Micron
2.5" x 9.75" 10 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...- $10.95
$19.93- $10.95
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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...- $74.95
$136.41- $74.95
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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....- $39.95
$72.71- $39.95
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5-Stage USA Made Nitrate Reverse Osmosis Filter Pack | FP5N-USA
Our 5-Stage Filter Pack includes silicone to lubricate the O-Rings and RO Sanitizing Solution, so that you can trust you water to be as clean as it can be. Fits Most Sump-Type Filters Using 2-1/2"x9.75" (10") Housings, Including the Following Models: Watts FMRO5G Watts...- $77.95
$141.87- $77.95
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5-Stage USA Made Chloramine Reverse Osmosis Filter Pack | FP5C-USA
Our 5-Stage Filter Pack includes silicone to lubricate the O-Rings and RO Sanitizing Solution, so that you can trust you water to be as clean as it can be. All Filters are NSF Certified for High Purity Reverse Osmosis Systems and are Made in...- $54.95
$100.01- $54.95
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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 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...- $139.95
$233.25- $139.95
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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...- $54.95
$100.01- $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 (1) RO Sanitizing...- $69.95
$127.31- $69.95
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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 Sanitizer Packet Syringe Membrane Sold Separately...- $29.95
$54.51- $29.95
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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...- $9.95
$7.19- $9.95
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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,...- $92.95
$169.17- $92.95
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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 (1)...- $54.95
$100.01- $54.95
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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,...- $49.95
$90.91- $49.95
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When it comes to replacement water filters, there are a few pieces of information that you need to know before you can buy the right cartridge for your needs:
1.What size filter housing do you have?
2.What specific water problem are you trying to treat?
3.Do you need a filter with a specific micron rating?
As you can see, you need to know what type of filter you have and what you're trying to achieve before you can choose the best water filter replacement cartridge. Once you have this information, you can select between the different filters that will fit into your system.
Replacement Water Filter Cartridge Sizes
There are four main sizes for standard water filter housings:
- 2.5“ x 10“
- 2.5“ x 20“
- 4.5“ x 10“
- 4.5“ x 20“
A number of additional, larger water filter sizes are available, but these are more commonly used in large-scale commercial and industrial environments. In-line replacement water filters are also available, but they do not need to fit inside a filter housing, so sizing is less of a concern.
You can often easily determine which size filter you need by checking your water filter system's owner's manual. If you don't have the manual, it's simple to measure your existing filter to learn what size it is. Open your filter housing and remove the old filter. In most cases, you simple need to unscrew the filter cap and pull the old one out. Using a tape measure, measure across the top end of the filter to get the width and down the length of the filter to get the height. Now you know what size you need.
Mark Timmons, the Water Doctor, discusses how to correctly size a water filter.
Filter Cartridge Options
Each of these types of filters removes or treats a different type of water problem. Not sure which type of filter you need? Check out our water problems page or call a Certified Water Specialist at 1-800-608-8792.
Micron Ratings
If you want to physically remove contaminants from your water, you'll likely be looking for a filter with a specific micron rating. A micron is a size measurement, equal to one micrometer. A common example used to understand how small microns are is the size of a single human hair, which is about 90 microns wide.
Replacement water filters, like sediment filters, that are made to physically filter out contaminants are typically given a micron rating. These ratings can range from 50 microns down to 0.35 or smaller. While a lower rating means that the filter will remove more contaminants, it also means that the water will move through the system more slowly and the filter will typically need to be replaced more frequently.