Faʻahinga ʻe niʻihi ʻo e afi deplete ʻokisikena, ka ʻoku ʻi ai ha niʻihi ʻoku ʻikai.
ʻOku longomoʻui ʻa e afi, tali oxidation e ʻea vela, fie maʻu ha ʻelemeniti ʻe tolu: ko ha oxidant, ha reductant, mo ha mafana ʻoku ne lavaʻi ʻa e ignition huʻanga.
Neongo ʻoku ʻiloa ʻa e ʻokisikena oxidizer, ʻOku ʻikai ko e fakafofonga pe ʻoku ne malava ʻa e fatongia ko ʻeni. Hange ko ʻeni, ʻi he afi ʻo fakapaaki ʻo e ʻo e, ʻOku fakaʻauha ʻa e fakapaaki ʻo e mo e ngaahi kasa chlorine kae ʻikai ko e ʻokisikena.