A waste collection manifold assembly 10 has a housing 13 and a strainer 80. The housing 13 has at least one input port 12A, 12B, 12C, 12D for receiving waste collection products 1 through a vacuum line 4. The housing 13 includes an interior chamber 11 for receiving the waste collection products 1 and a fluid discharge port 14 for passing fluids 6 into a waste collection unit 2. The strainer 80 is located in the chamber 11 and above the fluid discharge port 14. The at least one inlet port 12A, 12B, 12C, 12D is positioned to open alongside an interior chamber wall 13A of the housing 13 above the strainer 80 to direct the flow of the waste collection products 1 in a downward swirl along the interior chamber wall 13 A toward the strainer 80.