Unicel C-7407 Replacement Filter Cartridge for 100 Square Foot Baker-hydro UM-100 Diameter: 7-inch; length: 29 3/8-inch Top end cap: injection molded knob handle, 0-inch inner diameter; bottom end cap: injection molded cone adapter, 0-inch inner diameter Pleat count: 143; filter media: 4-ounce reemay 2040; filter area: 100 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications