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From the Manufacturer Hayward EC75A Basic Perflex 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-Gallon of treated pool water. An exceptional value as a replacement filter or for New pool installations. For sparkling, clean pools, step up to Perflex. Applications: In-ground pools of all types and sizes.