Grit slurry is introduced tangentially into the conical SpiraSnail clarifier. This tangential entry forces the grit to the outside of the clarifier cone. From there it settles into the SpiraSnail conveyor trough. The slowly rotating screw conveys the captured grit and dewaters it as it moves towards the discharge chute and into the grit receptacle ready for landfilling. Clarified water passes over the perimeter weir before being sent back to the plant for further treatment.

The length of the screw provides adequate time for a high level of dewatering.