Amanzi acocekileyo nakhuselekileyo kubasebenzisi beendawo zokuhlala kunye nezorhwebo.
Iingelosi zokucoca amanzi okusela zisebenza kakhulu ekunyangeni amanzi.Basusa iibhaktheriya, iintsholongwane kunye neekhemikhali, ezingenakukwazi ukujongana nazo.Kukho iintlobo ezintathu zokuhlanjululwa kweeNgelosi zokucoca amanzi okusela: MF, UF, kunye ne-RO.Zinokukunceda ukuba woyise le mingeni ingentla kwaye uqinisekise ukuba amanzi okusela akhuselekile, asempilweni kwaye angcamla ngcono ukusuka etephini.