Patent ID: 8052870

Claim:
An apparatus for use in a filter system for filtering water or wastewater, said apparatus comprising: (a) an underdrain lateral having at least one underdrain block for supporting at least a portion of a filter bed, said underdrain block having a plurality of exterior walls forming a substantially hollow interior; said underdrain block having a plurality of openings through which a fluid passes between said substantially hollow interior of said underdrain block and the filter bed during operation of the filter system; and, (b) a hold-down assembly operably associated with said underdrain lateral for preventing said underdrain lateral from lifting upwardly, said hold-down assembly including a support member extending substantially parallel to said underdrain lateral, said support member being spaced from said underdrain lateral, said support member including at least first and second segments, said first segment being a separate piece from said second segment; (c) said hold-down assembly further including a fixed anchor, said first segment and said second segment of said support member being connected to said fixed anchor; and, (d) said hold-down assembly further including at least one adjustable anchor operably associated with said first segment of said support member, said adjustable anchor being moveable along said first segment, said adjustable anchor engages at least a portion of said underdrain lateral to prevent said underdrain lateral from lifting upwardly said adjustable anchor is not grout or other substance that is applied in a viscous or semi-viscous state and subsequently hardened.