DE filters remove even the most minute dirt particles that normally pass through sand - it even removes dust and pollen! The exclusive Perflex "bump" system gives you long filter cycles between backwashing. Simply "bump" the handle to redistribute DE and you are ready to continue filtering. When DE is redistributed backwashing is reduced and DE is recycled, saving hundreds of gallons of pool water and saving you time and hassle. Maximum pool size 38,400 gallons (based on 8-hour turnover rate). 7 lbs. diatomaceous earth required (not included).
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.