Hayward W3EC50AC Perflex® Extended Cycle D.E. Filter! The Perflex Model EC50 is a high performance swimming pool filter with a filtration rating of 3,000 gallons (11 KL) per hour. Manufactured from durable, corrosion-proof materials, it is designed for continuousoperation, for installation above or below the pool water line, and for fresh or salt water swimming pools. The EC50 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 Perflex’s 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. Applications Above-ground/on-ground pools. Small in-ground pools. Features Easy access clamp assembly. Cleans pools fast -- removes even the smallest particles the first time through. Uses D.E. (diatomaceous earth) filter powder -- the most efficient dirt remover known for swimming pool filtration. Patented Flex-Tube™ system efficiently reuses D.E. 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. Uniquely designed to expel any air that may be present in the system through the filtered water returning to the pool. Combination diffuser and lower mixing chamber specifically designed to produce a uniformed coating of D.E. on the Flex-Tubes. Performance Data The EC50AC has a Effective Filtration Area 25 ft2 Design Flow Rate 50 GPM. Turnover In Gallons 24,000 in 8 hours and 30,000 in 10 hours. 1 Year Limited Manufacturer Warranty.