Thupi lothira madzi limapangidwa ndi screw axis yokhala ndi zomangira ndi kusuntha mbale zikudutsana, popeza mainchesi amkati a screw axis ndi yayikulu kuposa mbale yosuntha, mbale yosuntha imayenda mozungulira ndi screw axis kupewa kutsekeka.Danga pakati pa kukonza ndi kusuntha mbale limakhala laling'ono ndi laling'ono motsatira malangizo a matope.Pambuyo pa mphamvu yokoka, sludge imasamutsidwa kupita kumadera akusowa madzi m'thupi, imatulutsa madzi pansi pa mphamvu yamkati ya mbale yobwerera.