The Unicel C-6605 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-6605 Comp. Pool & Spa Water Filter has an outer diameter of 6 inches, with a length of 19 5/8 inches. This Unicel spa filter has a closed top with a crescent style handle, and an open bottom with a diameter of 1 15/16 inches. This Unicel C-6605 filter contains 50 square feet of filter media.