This 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. 60-square feet effective filtration area, 120-GPM flow rate. Turnover capacity of 8 hour-57600 gallons, 10 hour-72000 gallons, 12 hour-86400 gallons. Measures 22-inch length by 33-1/2-inch height by 22-inch width.