Indwangu yokududuza engenamanzi ayigcini nje kuphela amanzi, kodwa futhi ithambile futhi ikhululekile.Ngisho noma uyisebenzisa emvuleni, akudingekile ukuba ukhathazeke ngokuthi uzoba manzi.Inezici zokungangeni kwamanzi, okuthambile, okunethezekile, okulwa ne-oxidation, okungakhiqizi, okunganuki, njll. Isetshenziselwa ukuhamba ngezinyawo, imidlalo yangaphandle, ukufihla, ukwakhiwa, ukuphatha imithwalo, ukuphepha, ukulawulwa kwethrafikhi, ukuhlola, ukuhlelwa kwendawo, ukugandaya, ujantshi wesitimela, ukuthuthwa kwendle kanye nokuvolontiya Ngu.