Abstract: The apparatus has a lower manifold with a plurality of passageways each with an inlet and an outlet and an upper chamber has an inlet and a plurality of orifices leading to the plurality of passageways respectively between their inlets and outlets. A pressure tank having particulate media under pressure is provided with a main conduit coupled thereto. The main conduit splits into an air and media conduit portion which is coupled to the inlet of the upper chamber and an air conduit portion which extends upward for separating the air from the particulate media and then downward where it is coupled to the inlets of the passageways.