Unicel Replacement Filter Cartridge for Swimming Pool Filter Unicel UHD-SR70 70 Sq. Ft. Sta-Rite. Diameter: 8 11/16-inch; length: 18 3/16-inch Top end cap: open, 4-3/16-inch inner diameter; bottom end cap: open with 12 concentric slots, 4-3/16-inch inner diameter Pleat count: 195; filter media: 4-ounce reemay 2040; filter area: 72 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications