Patent ID: 7410578
Filing Date: 2008-08-12
Classification: B01D

Abstract:
1. Method of manufacturing an underdrain apparatus comprising the steps of attaching a cover to a water orifice member and attaching a bottom member to said cover and said water orifice member, said cover having an inside surface, said water orifice member having upper surface, an outside surface and an inside, said bottom member having an inside surface, said upper surface of said water orifice member and said inside surface of said cover defining an air passageway upon attachment of said cover to said water orifice member and said inside of said water orifice member and said inside surface of said bottom member defining a water passageway upon attachment of said bottom member to said cover, each of said cover, said water orifice member and said bottom member being an individual member and said air passageway and said water passageway being isolated from each other following said attachment of said cover to said water orifice member and said bottom member to said cover.