Multimedia Filter

Pressure vessels with sand or other loose media are widely used in industrial filtration applications. During the cleaning cycle "backwash", the bed is lifted (or "fluldized") to loosen the filter media and release trapped dirt which is removed in the backwash flow. After the backwash cycle, the bad is used following the settling to assure the filtration to service (i.e, normal flow). A 'filter to- waster" cycle is used following the settling to assure the filtration media has sufficiently re-stratified and that any loose dirt is removed from the underdrain / collectors