Anenge makore 6 000 apfuura, vaSumer vakawana chinwiwa chinofadza chakava chakakurumbira pasi rose: doro.Kuti uchengetedze kuenderana kwekunaka, kutsva uye kunaka kwedoro, iyo membrane filtration process panguva yekubika inoda kudzora zvakasimba hutachiona, organic matter, kujekesa, uye kuravira kuri nani.Dongguan Qinda ine makore gumi nemasere ebudiriro uye ruzivo rwekugadzira, yakasanganiswa nerabhoritari inogona kupa microbial uye yekuongorora masevhisi, kuve nechokwadi kugadzikana uye kushanda zvakanaka kwezvigadzirwa zvinopihwa.
