The Unicel C-6645 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-6645 Comp. Pool & Spa Filter Cartridge has an outer diameter of 6 9/16 inches, with a length of 17 5/8 inches. This Unicel pool filter has an open top and bottom, with both having a diameter of 2 3/8. This Unicel C-6645 filter contains 45 square feet of filter media.