Unicel Replacement Filter Cartridges

Unicel uses a "C-" prefix numbering system, and once you know the number for one cartridge size, the rest are easy to look up. C-4326 and C-4950 cover most of the small-to-mid spa cartridges you'll find in the wild. Bigger pool cartridges run into the C-7000s and up.

If your local pool store stocks one cross-reference brand, it's usually Unicel. Quality matches Pleatco for the same media, and the "C-" numbers are printed on most catalog pages, which makes them the easiest brand to verify against your existing cartridge. The 46 cartridges below show every Unicel C-series number with its Pleatco and Filbur equivalents.