Unicel C-7470 Replacement Filter Cartridge for 80 Square Foot Clean and Clear Plus, Waterway Crystal Water Diameter: 7-inch; length: 20-inch Top end cap: open, 3 0/0-inch inner diameter; bottom end cap: open, 3 0/0-inch inner diameter Pleat count: 170; filter media: 4-ounce reemay 2040; filter area: 80 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications