Unicel C-7454 Replacement Filter Cartridge for 150 Square Foot Waterco Trimline CC150 Diameter: 7 1/4-inch; length: 29 1/2-inch Top end cap: open with step, 3-1/16-inch inner diameter; bottom end cap: open with step, 3-1/16-inch inner diameter Pleat count: 201; filter media: 4-ounce reemay 2040; filter area: 150 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications