Abstract: In a modular water filtration and companion backwash assemblage, a reservoir is sectioned into an upper, supply chamber and a lower, drain chamber by a plurality of modular, horizontally co-planar filter cells. A carriage assembly is selectively positioned over an individual cell and a depending backwash hood is lowered to isolate, hydraulically, the modular cell. Water is pumped upwardly, out of the hood, expanding and scrubbing the filter media. Jetwash probes intensify the cleansing action, and a baffle plate having displacement accelerators ensures equal but swift upward displacement of backwash waters. Each cell is sequentially backwashed on a continuous basis, allowing uninterrupted operation of the other filtration modules.

Abstract: A scraper body is slid along the bottom of a rectangular sedimentation basin from one end to the other in such a manner that a scraper blade carried by the scraper body engages the bottom of the basin during the sediment collection and removal pass and piles up the sediment in front of the scraper body. During this pass, a suction assembly mounted on the scraper body continuously removes the sediment piled up by the scraper blade. At the end of the sediment collecting and removal pass, the scraper blade engages and rides up a riser ramp to an elevated position where the scraper blade remains elevated by magnets or spring clips during the return pass of the scraper body. At the end of the return pass, the scraper blade is moved out of holding engagement with the magnets or spring clips by a blade lowering ramp which urges the blade downwardly into contact with the basin bottom in preparation for another sediment collection and removal pass.