Umzimba wokukhupha amanzi wenziwa nge-screw axis ene-fixing kunye ne-pleyiti ezihambayo ezidlulayo, njengoko i-diameter yangaphakathi ye-screw axis inkulu kunepleyiti ehambayo, ipleyiti ehambayo yenza i-circular motion kunye ne-screw axis ukukhusela ukuvala.Isithuba phakathi kokulungiswa kunye neeplati ezihambayo ziba zincinci kwaye zincinci ecaleni kwendlela yokukhupha udaka.Emva koxinzelelo lwe-gravity, i-sludge ihanjiswa kwiindawo zokuchithwa kwamanzi, ikhupha phantsi koxinzelelo lwangaphakathi lwe-plate back outlet.