（1） Te horoinga whakarewa rauropi

Ko te nuinga o te wā ka whakamahia ngā whakarewa rauropi hei whakarewa i te hinu kua whakapūhuitia me te hinu kāore i whakapūhuitia hei tango i ngā paru hinu. Ko ngā whakarewa rauropi e whakamahia whānuitia ana ko te etanoru, te penehīni horoi, te toluene, te waro tetrachloride, te trichloroethylene, me ētahi atu. Ko ngā whakarewa whai hua ko te waro tetrachloride me te trichloroethylene, e kore e mura, ā, ka taea te whakamahi mō te tango hinu i ngā pāmahana teitei ake. Me mōhio anō hoki i muri i te tango hinu mā te whakarewa rauropi, me tango atu anō hoki he hinu tāpiri. Ina memeha te whakarewa i runga i te mata o tengongo tapawhā, he maha ngā wā ka toe he kiriata angiangi, ka taea te tango i tēnei i roto i ngā tukanga e whai ake nei pērā i te horoi kawakore me te tango hinu hikohiko.

（2） Horoi hikohiko

Ko te tango hinu katote, te whakamahi rānei i te anode me te katote, he mea e whakamahia whānuitia ana. Ko te hau hauwai i wehea mai i te katote, te hau hāora rānei i wehea mai i te anode mā te tauhohenga hiko, ka whakaohokia mā te mīhini e te otinga i runga i te mata o tengongo tapawhāhei whakatairanga i te mawhiti o te paru hinu mai i te mata o te konganuku. I taua wā anō, ka whakawhitiwhiti tonu te otinga, ka pai ake te tauhohenga saponification me te emulsification o te hinu. Ka wehea te hinu e toe ana mai i te mata o te konganuku i raro i te mana o ngā mirumiru e wehea tonutia ana. Heoi, i roto i te tukanga tango hinu cathodic, ka uru pinepine te hauwai ki roto i te konganuku, ka pakaru te hauwai. Hei ārai i te pakaru o te hauwai, ka whakamahia te cathode me te anode hei tango i te hinu i te taha kotahi.

（3） Te horoi kawakore

He tikanga horoi e ahu mai ana i te mahi matū o te kawakore e whakamahia whānuitia ana nā te mea he ngāwari te whakamahi, he iti te utu, ā, he ngāwari hoki te wātea o ngā rauemi mata. Nā te mea e whakawhirinaki ana te tukanga horoi kawakore ki te saponification, te emulsification me ētahi atu mahi, kāore e taea te whakamahi i te kawakore kotahi hei whakatutuki i te mahi o runga ake nei. He maha ngā momo wāhanga e whakamahia ana, ā, i ētahi wā ka tāpirihia ngā tāpiringa pēnei i ngā surfactants. Ko te kawakore te whakatau i te taumata o te tauhohenga saponification, ā, ko te kawakore teitei ka whakaiti i te taumahatanga mata i waenga i te hinu me te otinga, ka ngāwari ai te emulsification o te hinu. Hei tāpiri, ko te kaihoko horoi e toe ana ki te mata o tewāhanga poraka tapawhāka taea te tango mā te horoi i te wai i muri i te horoinga ki te kawakore.

（4） Te horoi i te matū horoi

He tikanga tango hinu whānui tēnei e whakamahia ana mā te whakamahi i ngā āhuatanga o te surfactant pēnei i te iti o te kukū o te mata, te pai o te whakamakuku me te kaha ki te whakapūmau. Mā te whakapūmau o te surfactant, ka hangaia he kopare kanohi ā-kanohi me te kaha motuhake ki runga i te hononga hinu-wai hei whakarerekē i te āhua o te hononga, kia marara ai ngā matūriki hinu ki roto i te wairewa hei hanga i te whakapūmau. Mā te mahi whakarewa o te surfactant rānei, ka kore e rewa te paru hinu ki te wai i runga i tengongo tapawhākua rewa ki roto i te micelle surfactant, kia taea ai te whakawhiti i te tae hinu ki te wairewa.