Hayward EC50AC Perflex D.E. Pool Filter,

Hayward Perflex D.E. filters provide the deepest, most comprehensive clean, removing microscopic dust and pollen as small as one micron. Perflex D.E. Filters have incorporated the patented Flex-Tube design in combination with D.E. filter powder, the most efficient dirt remover known for pool filtration. The result is superior water clarity, extended filter cleaning cycles, and no backwashing required. This filter also traps algae, and has an efficient one-pass cleaning power.