Kua puta ake te whakapapa kaihanga i waenganui i te wai hei hanga i ngā kaiwhakaahu, hei tūtohu whakamua mō te whenua, te rite ki ngā momo hoko e rua, me ngā paihere pai. I te matenga o tēnei mahi, ka whakamahi te wai hei take nui, kāore i te take kotahi i ngā take VOCs (Volatile Organic Compounds) - ā, ko tenei takoto whakaaetanga ka tae atu ki ngā paihere taiao i waenganui i te ao. Mai i te taha taiao, ka puta iti noa iho ngā pūtake i te wā o te hanga, ka whakaae ki ngā tikanga taiao whakatika i runga i ngā rohe e rima ana o te ao. Mai i te taha hangarau, ka whakawhanake te wai i waenganui i te take nei i ngā paihere o te inu me te wā o te mauku. Ka taea e ngā kaihanga te whakarerekē i enei tuhinga i te kitea ai ngā hiahia tirotiro o te kaupapa. Hei tauira, i te hanga i waenganui i ngā raraunga e noho ana, pērā i te kiko rākau rānei ko te pepa, ka whakamahi i te inu iti i te pai ai te whakaputa mai me te whakapono, ka puta he rangi pai me te tata ki te wā. Ki te wā, i te hanga i waenganui i ngā raraunga kore-tuku, pērā i ngā poraka rānei ko ngā mete, ka hanga i te inu nui i te kore raweke me te pai ai te whakaputa mai o te kōrero, ka pai ai te whakaputa pai. Ko te rite o te whakapapa kaihanga i waenganui i te wai ka whakawhanake ki ngā momo hanga e rima ana. I roto i te whenua o ngā kākahu, ka whakamahi hei hanga i ngā rarangi pai ki runga i ngā kākahu, ngā pouaka rānei me ngā kaiwhakaahu whare. Ka pai te wai i waenganui i te kiko rākau, ka noho pai ai te uara me te kīwaha o te raraunga, ka whakamahi pai ai te whiti o ngā tae. I roto i te whenua o ngā tohu rānei me ngā kaihanga, ka whakamahi hei hanga i ngā karu pai, ngā papahere rānei me ngā tohu. Ka taea te hanga i waenganui i ngā raraunga e rima ana, pērā i ngā poraka, PVC, me ngā akiriki, ka whakaaetanga ia hei whakaaetanga mō ngā kaupapa waewae rānei me ngā kaupapa marangai. Ko tētahi pai nui o te whakapapa kaihanga i waenganui i te wai, ko tana pai ki te whakatika. Ina ka whakamahi te wai hei take nui, ka taea e ngā kaihanga te whakatika i a rātau ngā kaihanga, ngā kaiwhakaatu rānei me ngā kaiwhakatū e rima ana, ki te wai me ngā take iti. Kāore i te utu e whakaaetanga ai ki te utu take whakatika, ka whakaiti hoki te pūnaha o te take whakamahia e ngā kaimahi kaihanga. Heoi, kei te rite ki tētahi momo hanga e rima ana, ka noho te whakapapa kaihanga i waenganui i te wai, ka hē ki te wā e tae ana i te wā o te hanga i waenganui i ngā take e rima ana. Ka noho motuhake te wā o te hanga, e whiwhi ana i te wā o te hanga i waenganui i ngā kaupapa e rima ana. Ki te whakatika tenei, ka whakamahi ngā kaihanga i ngā kaiwhakatika motuhake pērā i ngā kaiwhakatika ira rānei me ngā kaiwhakatika hāpai. Mō ētahi raraunga e rima ana, ka noho iti noa iho te paihere o te wai i waenganui, ka whakamahi ngā take tūmanako rānei me ngā kaupapa whakatika mō te paihere pai. Kei te whiwhi i ēnei tūmanako, ka whakamurihia te whakapapa kaihanga i waenganui i te wai, ka whakamahi pai ai te wā o te hanga, te paihere, me te whiti o ngā tae. Noho anō hoki te tono whiwhi mō ngā ratonga whakamahia pai, ka whakamahi te whakapapa kaihanga i waenganui i te wai i waenganui i ngā whenua e rima ana, ka whakaaetanga ia hei whakaaetanga mō te wā o te hunga.