The Unicel C-4401 R is a compatible replacement for the following pool and spa filter cartridges:
The Unicel C-4401 Comp. Pool Filter Cartridge is constructed with pleated Reemay filter media and reinforced antimicrobial end caps. This pool filter cartridge improves water clarity and quality through 35 square feet of premium media. This compatible Unicel spa filter, also known as the Filbur FC-2386, measures 4 15/16" x 4 5/8" with 2 1/8" Open top and bottom styles.