Abstract: A tubular member is received coaxially within a tubular housing, has a plurality of lower and upper openings, and has a sealing flange between the top and the bottom ends of the hollow member. The flange cooperates with the housing to direct the wastewater to flow into the hollow member through the lower openings, while a portion of the solid waste matter is not permitted to flow through the lower openings, in a first filtration stage. The wastewater is then directed to flow upward and back out of the hollow member through the upper openings, while any remaining portion of the solid waste matter is not permitted to flow through the upper openings, in a second filtration stage.