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Suction Lift Clarifiers - Kusters Water


engineered for enhanced performance and reliable operation


engineered for enhanced performance and reliable operation

Suction Lift Clarifiers

Kusters Water rapid sludge removal clarifiers are specifically designed to provide quick and uniform removal of return activated sludge (RAS), Model HBSL collectors utilize collection pipes located at multiple points along each arm. Suction generated by a differential head developed from the partially submerged return sludge well located at the center of the clarifier. Each collection pipe is equipped with a return flow variator that controls the rate of sludge return and provides a visual indicator of the quality of RAS. Every pipe discharges into the rotating center return sludge well, then by gravity exits through a vertical steel pipe located inside the center pier. The size and quality of pipes are selected according to the RAS flow rates.

Vertical Tube, Suction Lift Clarifiers (HBSL-S)
Model HBSL-S, featuring vertical draft tubes and rotating sludge collection troughs simplify operations. The unique design of the vertical RAS pipes are less prone to clogging, easy to clean, provide better visibility of RAS flow, and improve surface scum collection via the rotating RAS trough, resulting in no scum pits required, no scum pumps, etc.

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  • Uniform sludge removal over entire basin
  • Minimizes “rat-holing”
  • Visual indication of RAS
  • Individual control of each RAS line
  • No scum skimmer or scum trough required (Model HBSL-S)
  • New or Retrofits


  • Painted Steel
  • 304 or 316 Stainless Steel
  • Hot Dip Galvanized Steel
  • Specialty Stainless Materials

Download Product Brochure