Amanzi awumthombo wokuphila nesithako esiyisisekelo sazo zonke izinto eziphilayo.Ngokukhula kwesibalo sabantu kanye nokuthuthuka komnotho, isidingo nezinga lamanzi liya ngokuya likhuphuka.Kodwa-ke, izinga lokungcoliswa kwemvelo liya liba nzima futhi indawo yokungcola iya ngokuya iba nkulu.Kuthinta kakhulu impilo yethu, njengezinsimbi ezinzima, izibulala-zinambuzane, amanzi angcolile avela ezitshalweni zamakhemikhali, indlela eyinhloko yokuxazulula lezi zinkinga ukwenza ukwelashwa kwamanzi.Inhloso yokwelashwa kwamanzi ukuthuthukisa izinga lamanzi, okungukuthi, ukususa izinto eziyingozi emanzini ngokusebenzisa izindlela zobuchwepheshe, futhi amanzi ahlanzekile angahlangabezana nezidingo zamanzi okuphuza.Lolu hlelo lufanele amanzi angaphansi komhlaba kanye namanzi angaphansi njengendawo yamanzi aluhlaza.Amanzi aphathwa ngobuchwepheshe bokuhlunga kanye nobuchwepheshe be-adsorption angafinyelela ku-GB5479-2006 “Izinga Lekhwalithi Lamanzi Okuphuza”, CJ94-2005 “Izinga Lekhwalithi Lamanzi Okuphuza” noma “Izinga Elijwayelekile Lamanzi Okuphuza” leNhlangano Yezempilo Yomhlaba.Ubuchwepheshe bokuhlukanisa, kanye nobuchwepheshe bokuvala inzalo.Ngekhwalithi yamanzi ekhethekile, njengamanzi olwandle, amanzi olwandle, dweba inqubo yokwelapha ngokombiko wangempela wokuhlaziya izinga lamanzi.