Muchina wekusvina mvura unoshandiswa pakukora nekupukuta mvura zvine hungwaru. Mvura yetsvina imvura ine huwandu hwezvinhu zvakanyungudutswa, zvinogona kugadzirwa kubva mukuchenesa mvura yakasviba, indasitiri yekugadzira chikafu, indasitiri yemakemikari nedzimwe nzvimbo dzebasa revanhu.

Muchina wekubvisa mvura we screw-press sludge muchina mutsva wekuparadzanisa mvura we solid-liquid, unoshandisa musimboti we screw extrusion, unogadzira simba rakasimba rekubvisa mvura kuburikidza nekuchinja kwe screw diameter ne pitch, pamwe ne mukaha mudiki uri pakati pe ring inofamba ne ring yakagadzika, kuti pave nekubviswa kwemvura kwe sludge.