Abstract: An arrangement for cleaning algae and other debris from the various surfaces within a sedimentation tank includes one or more mechanized rotating scrubbing brushes. In contrast to conventional arrangements that use rectangular, non-mechanized brushes, the rotational brush elements of the present invention are more effective and efficient at removing a larger quantity of material from the various interior wall surfaces (e.g., baffle, weir, spillway, etc.) within the sedimentation tank.