The most efficient dirt remover known for swimming pool filtration. Hayward Perflex D.E. filters provide the deepest, most comprehensive clean, removing microscopic dust and pollen as small as one micron – one hundred times smaller than a grain of salt. Completely clean in one pass. Hayward Perflex D.E. filters take care of debris the first time through, so you can run it fewer hours per day. That adds up to big savings on your electric bill. And Hayward Perflex D.E. filters need only three or four charges of D.E. powder per season, because each charge keeps your pool clean for four weeks. It's all in the flex. Patented Flex-Tubes™ make the Hayward Perflex D.E. filter unique. D.E. filter powder coasts the tubes and traps dirt and impurities as they pass through the filter. When the accumulated dirt builds up pressure and decreases the flow, conventional filters require backwashing. But with the Hayward Perflex D.E. filter, simply move the unique "Bump" handle up and down a few times to automatically activate the Flex-Tubes, repositioning the dirt and D.E. within the filter and extending the filter cycle. And since Perflex cleans without backwashing, you'll save hundreds of gallons of treated pool water, eliminating the problem of wastewater disposal while conserving energy. Best performance. Best Value. Hayward Perflex D.E. filters give you the performance you want and the sparkling water you need to enjoy your free time. Its superior design and corrosion-free construction will provide you with years of swimming pool perfection. And when you install your Perflex filter as part of the Totally Hayward System™, you get the assurance of knowing you have a complete system, designed to work together for the best operation and the cleanest, clearest water possible – all backed by the extended warranty. Performance Data Series Model Number Effective Filtration Area Design Flow Rate* Turnover (In Gallons) 8 Hours 12 Hours EC30 15 FT.2 30 GPM 14,400 21,600 EC40AC 20 FT.2 40 GPM 19,200 28,800 EC50AC 25 FT.2 50 GPM 24,000 36,000 Energy Savings. For proper filtration, your filter system should provide a complete turnover of the pool water once every 12 hours. To determine the correct size Perflex system, consult your swimming pool dealer. Because Peflex filters are designed for high-efficiency, you may use the 8-hour turnover rate and save energy costs by operating the system less hours.