Nano shanu-mavara hollow quartz mabhora, ane mukati megomba chimiro, anogona kuumba yakaderera-oxygen nharaunda, kurima anaerobic bacteria, uye kupa iri nani nzvimbo yekubereka.Mavara mashanu, kushandiswa kwakasiyana, mhedzisiro iri nani kana yakashandiswa pamwechete.