• The main box is a hopper whose two lateral sides are tilted and join the trough of the extraction screw located in the lower part.
• The input housing of the raw effluent to be treated, comprises a flow distributor which reduces turbulence in the device.
• Sand falls towards the Archimedes’ screw, while clear water passes over the weir and flows into a chute.
• The sand accumulated at the bottom is lifted by the Archimedes’ screw to the jetty at the top, located above the water level.
• Once above the water level, water jets ensure the washing of the organics contained in the sand.

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• The axe less Archimedes’ screw is made of thick hard steel. It is driven by the gear motor located in the upper part.
• The screw is set on three attrition plates, made of anti-abrasion stainless steel, welded to the bottom of the trough.
• On its upper part, the trough is provided with a screwed cover.
• The inlet and water outlet are provided with flanges.
• A sand outlet chute is also provided.
• An articulated hatch enables the operator to inspect the water outlet.
• Until SERSAB 200 model, the geared motor is flanged-set.
  For larger models, the geared motor is mounted floating.
• The device is equipped with support feet.