Ngā āhuatanga matua o te mahi me te hanganga:
I raro i te mahi a te whakamahana me te kawe hau wera i roto i te wāhanga oumu, ka whakakorikori te kiriata wehewehe i te CH₂Cl₂ ki runga i te mata, ko tētahi wāhanga o te āhua hau ka whakakōpikopikotia hei wai, ko tētahi wāhanga o te hau hiku kāore i whakakōpikopikotia ka whakamahia hei hau whakamaroke haereere, ā, ko tētahi atu wāhanga ka tukuna ki roto i te pūnaha whakaora hau hiku. Ka whiriwhiria e mātou he waro whakahohe anga kokonati motuhake kua whakaritea, he painga o te kaha mimiti nui o te CH₂Cl₂, te pai o te purenga me te pai o te wai. I roto i te āhua o te tāke mimiti whakapae, he nui te kaha uta waro, he teitei te ngāwari o te mahi, ko te kukū hau hiku o te CH₂Cl₂ he iti iho i te 20mg/m³, ā, ko te tere whakaora he neke atu i te 99.97%.