Oku kuchazwa kukubonelela ngomgangatho wokwenziwa kwenkqubo yemibhobho yokuhambisa amanzi, igesi kunye ne-oyile kumashishini e-oyile negesi yendalo.
Kukho amanqanaba amabini okucaciswa kwemveliso, i-PSL 1 kunye ne-PSL 2, i-PSL 2 ineemfuno ezinyanzelekileyo zokulingana kwekhabhoni, ukuqina kwenotshi, amandla aphezulu esivuno kunye namandla okuqina.