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Filter United / Individual replacements

Reverse Osmosis Filter Cartridges

Keep fresh-tasting water flowing. Shop individual Filter United sediment and carbon cartridges, RO membranes, inline filters, and UV components for your next filter change.

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9 parts

Helpful details

A little more
about your replacement.

Sizes, capacity options, and filter care.

What size are the sediment and carbon cartridges?

Our standard sediment, carbon block, and GAC cartridges use the common 10 x 2.5 inch format for compatible conventional RO prefilter housings. Use the dimensions and cartridge design on your existing part to match your replacement.

Standard RO prefilter dimensions: 10 inch length and 2.5 inch diameter
The standard-size fit shown applies to prefilter cartridges. Membrane, inline-filter, and UV fit are specified separately.
Which RO membrane capacity should I select?

Select the 50, 75, or 100 GPD capacity specified for your system using the dropdown on the membrane card, then add it to your cart. Your current membrane label is a useful reference. For a capacity change, confirm the membrane housing and flow-restrictor requirements with your system instructions or our team.

What is the difference between carbon block and GAC?

Carbon block uses compressed activated carbon; GAC uses granular activated carbon. Both are used for chlorine, taste, and odor treatment. Choose the media type shown in your system's filter sequence.

Illustration of sediment and carbon block prefiltration stages
Example of sediment and carbon block stages. Your system's instructions determine its filter sequence.
What do the inline post-carbon and alkaline filters do?

The post-carbon filter polishes taste after RO treatment. The alkaline filter adds calcium carbonate mineral media after RO treatment. These listings use 1/4 inch quick-connect fittings; match your existing filter's connections, flow direction, and available space. Final pH depends on water and operating conditions.

Where can I find the UV component's installation details?

Open the V21UVLED product page for the component information. Use its installation instructions for electrical, connection, and flow requirements. Our team can help with questions about your setup.

How do I change and flush an RO cartridge?

Follow your system manual for shutoff and depressurization, then replace the specified cartridge and inspect the seals. Restore the supply, check for leaks, and complete the directed flushing procedure. Follow each component's service schedule. Powered UV servicing requires its own instructions.

Overview of changing a standard housing-style RO cartridge
Illustrated overview; use the full procedure in your system manual.

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