Unicel 6-Pack 75-sq ft Pool Cartridge Filter

New Unicel C 8600 Replacement Filter Cartridge. Industry's most complete line of replacement filter elements. For use with Marquis Spas. Cal Spas. Hayward Pool Products (CX800RE). And More. Sharp pleat folds maximize spacing between pleats. Tough urethane end caps assure durability for the life of the cartridge. Outside Diameter: 8-1/2 inches.