Ibhokisi likagesi lohlobo lwehinge yensimbi engagqwali linehinge lensimbi engagqwali eliqinile kanye nendawo ebiyelwe eqinile yepulasitiki. Idizayinelwe ukusebenza okungangenwa amanzi, uthuli, nokusebenza kokuvikela ukugqwala, ilungele ukusetshenziswa kwangaphandle. Izinketho zokusika imbobo ezenziwe ngendlela oyifisayo ziqinisekisa ukuguquguquka ukuze kuhlangatshezwane nezidingo eziqondene nomsebenzisi, okuhlinzeka ngokuvikeleka okuthembekile ezindaweni ezinokhahlo.