暗渠フィルタ・ブロックおよび暗渠フィルタ・ブロックを設置する方法

摘要

An underdrain filter block includes a top wall, a pair of side walls extending from the top wall, a bottom wall extending between the pair of side walls, first and second ribs, and a wall segment extending between the first rib and the second rib to define a grout chamber configured to receive grout during installation of the underdrain filter block.