Patent ID: 7820043

Claim:
An apparatus for use in a filter system for filtering water or wastewater, said apparatus comprising: (a) an underdrain block for supporting at least a portion of a filter bed of a filter system, said underdrain block having a plurality of exterior walls forming a substantially hollow interior for receiving fluids during operation of the filter system, said underdrain block having a longitudinal axis; (b) a hold-down assembly including an anchor assembly adapted to be embedded in a floor of a filter system and a hold-down member for engaging at least a portion of said underdrain block, said hold-down member being secured to said anchor assembly and adjustable relative to said anchor assembly to vary a position of said hold-down member along said longitudinal axis of said underdrain block, said anchor assembly includes a support member, said hold down member is a clip slidably mounted on said support member so that a position of said clip relative to said underdrain block may be varied.