The Unicel C-2305 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-2305 Comp. Replacement Pool Water Filter has an outer diameter of 2 3/4 inches, with a length of 5 1/8 inches. This Unicel pool filter has an open top with diameter of 1 1/16 inches, and an open bottom with a diameter of 1 5/8 inches. This Unicel C-2305 filter contains 50 square feet of filter media.