I-1, inamandla empembelelo elungileyo, uzinzo olufanelekileyo lomda, kunye ne-non-toxic kunye nencasa, impilo yokusingqongileyo.
2, ineempawu ezigqwesileyo zeekhemikhali kunye neempawu zokugquma umbane, ukumelana nobushushu okulungileyo, akukho siphene, akukho lula ukukrwempa.
I-3, ukuqina okuhle kakhulu, izinga lokufunxa kwamanzi aphantsi, ukuxhathisa okulungileyo kokuhlwa, ukudibanisa okulula, ubomi benkonzo ende.
I-4, enemibala eyahlukahlukeneyo, etyebileyo ngokumila kunye nombala, ineqondo elihle lobuhle kunye nokusebenza.
Ngolunye lolona khetho lubalaseleyo kwezona faucets zangaphandle.
