The highest water clarity with the lowest amount of fuss. Quad D.E. pool filter combines the finest pool filtration available for the most sparkling clear water with the convenience and easy cleaning features usually found only in a cartridge filter. Four easily-accessible and removable D.E. cartridges simplify maintenance and save time. Four large-capacity cartridges provide maximum filter surface area for greater dirt-trapping capacity and longer periods between cleaningsUnique internal flow path ensures optimum filtration and backwashing efficiencyChemical resistant, fiberglass-reinforced polypropylene tank for exceptional strength and long lifeEasily removable cartridge elements make maintenance fast and easyWater flows through the Quad D.E. Cartridge Style Pool Filters so efficiently that your pump will use less energy