Isahani ya diafragm igizwe na diafragma ebyiri hamwe nisahani yibanze ihujwe nubushyuhe bwo hejuru.
Iyo itangazamakuru ryo hanze (nk'amazi cyangwa umwuka wugarijwe) ryinjijwe mucyumba kiri hagati yisahani yibanze hamwe na membrane, ururenda ruzaba rwinshi kandi runyeganyeza agatsima kayunguruzo mu cyumba, bigere no gukuramo kabiri kwa dehidrasi ya cake ya filteri.