Pentair 188594 Quad D.E. Cartridge Style D.E. Pool Filter, 100 Square Foot, 160 GPM Four large capacity cartridges provide maximum filter surface area for greater dirt-trapping capacity and longer periods between cleanings Unique internal flow path ensures optimum filtration and backwashing efficiency Chemical resistant, fiberglass reinforced polypropylene tank for exceptional strength and long life Easily removable cartridge elements make maintenance fast and easy Water flows through the Quad D.E. so efficiently that your pump will use less energy; measures 22-inch length by 50-inch height by 22-1/2-inch width