The Unicel C-2303 R is a compatible replacement for the following pool and spa filter cartridges:
The Unicel C-2303 Comp. Pool & Spa Cartridge is constructed with pleated Reemay filter media and reinforced antimicrobial end caps. This pool filter cartridge improves water clarity and quality through 9 square feet of premium media. This compatible Unicel spa filter, also known as the Filbur FC-2324, measures 2 7/8" x 17 1/16" with 2 1/8" Open top and bottom styles.