Hayward Perflex® Extended-Cycle D.E. FIlter

Perflex Extended-Cycle D.E. filters clean above ground pools fast and effectively, able to remove particles as small as two microns the first time through. Its patented Flex-Tube™ design and exclusive "BUMP" action means longer filtration cycles and no backwashing.  It also saves on filtration material: the Perflex uses the same D.E. filter powder over and over by periodically regenerating the powder by the way it drains. That's why they call it the Extended-Cycle System.  No backwashing saves hundreds of gallons of treated pool water, making the EC50 series an exceptional value as a replacement filter or for new pool installations.