RO water system, RO water Filter, Automatic RO Membrance, Force Pretreatment Backflush, 98% Desalting Rate. RO water filter, RO water system, RO water purifier:Key Specifications/Special Features for EW-RO-450AL/H RO water filterRating ... the pressure of flow pipe, produce water, supply water, and pause by water overfull or lackAutomatic RO membrance flushing 2 minutes each hourForce pretreatment ...