Filter Kits

Replacement cartridges, membranes, and resin — matched to your exact system.

Filters
19 products
NEED HELP CHOOSING?

Pick the right system in three steps.

  1. Test your feed water (TDS, pressure, temperature).
  2. Set your target output in GPD.
  3. Match a system rated for that output at your conditions.
Open the buying guide
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How to choose

Finding the right replacement filter kit

Replacement intervals depend on your feed water and how hard you run the system, but a good rule of thumb: sediment and carbon pre-filters every 6–12 months, the RO membrane every 2–3 years, and DI resin whenever your TDS meter climbs above zero.

Match the kit to your system. Use the replacement finder — enter your model and see exactly what fits, no guessing.

Want longer intervals between changes? Our MaxCap and high-capacity DI cartridges last longer than standard mixed-bed resin.