The Centra-flo™ Gravity Sand Filter is a dynamic bed filter that provides a continuous supply of filtered water without interruptions by backwash cleaning cycles. The Centra-flo™ can be used whenever an application requires granular media filtration for the removal of colloidal and suspended solids.
Influent enters the center of the filter through a feed chamber and flows through layers of increasingly finer sand*.
Solids captured in the filter bed are drawing downward with the sand into the suction of an airlift pump. The turbulent, upward flow in the airlift provides a scrubbing action that effectively separates the sand from the solids before discharging into the filter washbox.
*Down-flow specific.
The washbox is a baffled chamber that allows for counter-current washing and gravity separation of the cleaned sand and the concentrated waste solids. This process is accomplished by utilizing filtered water to clean the contaminated sand. Regenerated sand is returned to the top of the filter bed and the waste solids, or “reject”, is piped to a suitable disposal point.
