1). He pepa muka motuhake he nui te uruhanga makuku, he pai te ātete ki te hau, he ātete ki te haehae, he ātete ki te koroheketanga, he ātete ki te harore, me ētahi atu.

2). He ABS te anga, he ātaahua te āhua, kāore e ngāwari te pakaru, he roa te wā mahi, he pai mō te taiao, he pai te ātete hau, he whakarite i te kaha me te pūmau o te hanganga, ka whakaiti i te rere whakamuri.

3). He hongere tapawhā rite, he tawhiti pereti whaitake, he iti ake te tautoko o roto, he iti te ātete i te huarahi, he iti ake te ngaronga o te hau, kia tino tika ai te horahanga matua whakawhiti wera kia eke ki te tino pai.

4). Hanganga mō te kōwae, e whakarato ana i ngā huinga rahi rerekē o ngā taha me te matotoru o te pereti.

5). Kāore he wāhanga neke, he iti te utu tiaki, he hanganga kiato, he iti te rahi, he pai mō ngā huihuinga maha.

6). Ka taea te whakamahi i te horoi korehau hei horoi i te puehu me ngā mea ke i runga i ngā taputapu, he ngāwari ki te whakamahi me te tiaki.

Ko te matua whakawhiti wera ERC he mea hanga ki te pepa muka paturopi me te pepa antibacterial, he nui te uruhanga makuku, he ārai-haehae, he ārai-koriri;

he pakari te anga ABS, he pai mō te taiao, ā, he roa te wā mahi;

He mea hanga te pereti taupoki ki te pepa piauau me te kakau kirihou, whatu rānei.

Ka whakamahia te matua whakawhiti wera ERC mō te pūngao whakaora pūngao (ERV), ka taea te rere o te hau ki te 30,000 m3/h, tae atu ki ngā pūngao whare me ngā pūngao arumoni. Ka puta te haumākū me te wera ina whiti ngā hau e rua he rerekē te pāmahana me te haumākū mā roto i te matua whakawhiti wera, ka wehea katoatia te hau hou me ngā awa hau putanga kia kore ai e puta he haunga me te makuku, ka whakawhitia te pāmahana mai i te taha wera (mātao) ki te taha makariri (wera) ā, ka whakawhitia te haumākū mai i te taha nui (iti) ki te taha iti (nui) hei whakaora i te wera me te pūngao.