Abstract: A system for anchoring an underdrain is disclosed. The underdrain having a top surface, a bottom surface positioned opposite the top surface, a first side, and a second side positioned opposite the first side. A base grout layer is on a floor surface of a water filtration system. A reinforcement structure is within the base grout layer, with a protruding portion of the reinforcement structure extending from the base grout layer. A method includes positioning the underdrain on the base grout, with the protruding portion of the reinforcement structure positioned along at least one of the first side and the second side of the underdrain, and installing a fill grout layer onto the base grout layer, with the fill grout layer covering at least a portion of the protruding portion of the reinforcement structure.

Abstract: A filtration system includes a plurality of underdrain blocks arranged in a side-by-side configuration so as to define a gap therebetween, the gap configured to receive grout. Each underdrain block includes a top wall, a bottom wall, and a plurality of side walls connecting the top wall and the bottom wall. A grout bridge is arranged in the gap between adjacent underdrain blocks so as to form a grout seal between the grout bridge and adjacent side walls of the adjacent underdrain blocks. The adjacent sidewalls each include a rib, each rib defining a slot. The grout bridge is arranged in adjacent slots of the adjacent sidewalls of the adjacent underdrain blocks. A method of arranging a filtration system and a grout bridge are also disclosed.

Abstract: A filtration system includes a plurality of underdrain blocks arranged in a side-by-side configuration so as to define a gap therebetween, the gap configured to receive grout. Each underdrain block includes a top wall, a bottom wall, and a plurality of side walls connecting the top wall and the bottom wall. A grout bridge is arranged in the gap between adjacent underdrain blocks so as to form a grout seal between the grout bridge and adjacent side walls of the adjacent underdrain blocks. The adjacent sidewalls each include a rib, each rib defining a slot. The grout bridge is arranged in adjacent slots of the adjacent sidewalls of the adjacent underdrain blocks. A method of arranging a filtration system and a grout bridge are also disclosed.