The Unicel C-6405 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-6405 Comp. Replacement Pool Filter has an outer diameter of 6 1/16 inches, with a length of 12 1/16 inches. This Unicel spa filter has an open top and bottom with both having a diameter of 1 5/16 inches. This Unicel C-6405 filter contains 50 square feet of filter media.