Hayward W3EC75A Perflex® Extended Cycle D.E. Filter! The Perflex Model EC75A is a high performance swimming pool filter with a filtration rating of 4,800 gallons per hour. The EC75A filter uses diatomite filter powder (commonly called D.E.). D.E. is the most efficient dirt remover known. It is normally fed into the system through the skimmer when the filter is initially started; then drained from the filter when its dirt holding capacity has been reached. Through Perflexs exclusive BUMP action, the D.E. is periodically regenerated and the filter cycle extended without changing the powder. When the filter powder is totally used, the BUMP action makes it possible to drain the used diatomite without backwashing or dismantling the filter. Perflex Extended-Cycle D.E. filters clean pools fast, removing particles as small as one micron the first time through. Its patented Flex-Tube design gives longer cycles between cleaning because the same D.E. filter powder is used over and over. Plus, Perflex cleans without backwashing, saving hundreds of gallons of treated pool water. Applications Inground pools of all types and sizes. Features Exclusive bump handle activates the mechanism causing the Flex-Tubes to instantly and uniformly clean themsleves of dirt and filter powder. Self-venting design automatically expels any air that may be present in the system. Proven, patented Flex-Tube filter elements efficiently reuse the filter powder and firt mixture forming a fresh filtering surface.. Combination pressure gauge and threaded inspection/service port is easy to read and remove when filter needs cleaning. Performance Data Effective Filtration Ar 40 ft2 Design Flow Rate 80 GPM. . Turnover In Gallons 38,400 in 8 hours and 48,000 in 10 hours. 1 Year Limited Manufacturer Warranty.