Unicel C-9650 Replacement Filter Cartridge for 50 Square Foot Jacuzzi CFR-50 Diameter: 9 15/16-inch; length: 10-inch Top end cap: open, 5 13/16-inch inner diameter; bottom end cap: open, 6-1/16-inch inner diameter Pleat count: 194; filter media: 4-ounce reemay 2040; filter area: 50 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications