Rg Delaware, Inc.

Aleksandr Vladimirovich Ilyin

R Lee Roberts

Mark Kevin Addison

Jason Samuel Schmoyer

A filter system for filtering water and/or wastewater which includes an underdrain system having a plurality of laterals that are anchored to the floor of a filter by a hold-down assembly. Preferably, the hold-down assembly does not rely on grout or other substance that is applied in a viscous or semi-viscous state and subsequently hardened as the primary means for connecting the underdrain laterals to the floor of the filter. Preferably, the hold-down assembly includes hold-down clips that can move relative to an anchor assembly and corresponding underdrain blocks so that the hold-down clips can cooperate with any desired portion of the corresponding underdrain blocks.

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Chester Spring, PA, United States of America

Aleksandr Vladimirovich Ilyin