Patent ID: 6406620
Filing Date: 2002-06-18
Classification: B01D,E03F,E04D

Abstract:
A rainwater filter assembly comprising a housing and a filter means for positioning below a downpipe shoe, said housing comprising an inlet for receiving rainwater discharging from a downpipe, an outlet for connection in series with an underground pipework, and housing walls defining a silt collection chamber in the flow path between said inlet and said outlet, whereby silt settles in said silt collection chamber from rainwater passing from said inlet to said outlet, said housing walls comprising a silt collection chamber base, and said filter means being supported by said housing for filtering coarser material than silt from rainwater which passes from said inlet to said outlet, said outlet comprising an outlet entrance positioned higher than said base, for allowing rainwater to pass from said silt collection chamber to said outlet, the filter means comprising first and second filters positioned in series with each other in said flow path, and further comprising a second filter bypass means for enabling some excess water flowing from said silt collection chamber to pass to said outlet entrance without passing through said second filter, the second filter comprising a downwardly directed skirt coaxial with said outlet entrance, and said outlet comprising an outer surface coaxial with said outlet entrance, said second filter bypass means comprising an annular passage defined radially between said downwardly directed skirt and said outlet outer surface.