Patent ID: 7771597

Claim:
A filter system for clarifying water or wastewater, said filter system comprising: (a) at least one filter compartment having at least one layer of filter media and an underdrain, said at least one layer of filter media being disposed above said underdrain, said filter compartment having at least one inner wall; (b) an influent feed trough operably associated with said filter compartment for directing influent to said filter compartment for subsequent filtration, said influent feed trough being disposed outside of said filter compartment, said influent feed trough having a bottom and first and second sidewalls, said bottom of said influent feed trough being disposed above said at least one layer of filter media; and, (c) a weir plate for controlling the flow of influent into said filter compartment, said weir plate being a separate piece from said influent feed trough, said weir plate having an upper end and a lower end, said lower end extending into said influent feed trough and said upper end extends above an uppermost portion of at least one of said first and second sidewalls of said influent feed trough.