Details: The Hayward EC40 above ground pool filter provides the deepest, most comprehensive clean, even removing microscopic dust and pollen. The result is crystal clear, sparkling water at an economical price. Patented Flex-Tube system efficiently reuses DE powder and dirt mixture to form fresh cleaning surfaces. Exclusive bump handle activates the Flex-Tubes, causing them to instantly purge themselves of dirt and powder. The EC40 is uiquely designed to expel any air that may be present in the system through the filtered water returning to the pool. Max pool size 19,200 gallons. Includes 1HP Power-Flo Matrix pump.