Patent ID: 7820040

Claim:
A device for filtering pollutants from fluid, the device comprising: a chamber having an inlet and outlet; a plurality of pivotal filter assemblies arranged in series in the chamber between the inlet and the outlet, wherein each filter assembly includes a filter that pivots from a filtering position to a bypass position, in the filtering position the fluid flows through the filter to remove at least some of the pollutants from the fluid, in the bypass position the fluid flows around and bypasses the filter, and the filter pivots from the filtering position toward the bypass position under increased pressure from the fluid flow as the filter becomes clogged with the pollutants, wherein the pivotal filter assemblies each further include a weir, and the corresponding filters extend from the weirs; and wherein the weirs each have an open bottom and a bore in communication with the open bottom, wherein the filters are removably received in the corresponding weir bores and extend downwardly from the weirs through the open bottoms.