Unicel C-7699 Replacement Filter Cartridge for 100 Gpm Pac-fab, 105 Gpm Wet Institute Diameter: 7 7/8-inch; length: 22 1/8-inch Top end cap: open, 3-1/16-inch inner diameter; bottom end cap: open, 3-1/16-inch inner diameter Pleat count: 142; 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