Mō ngā tikanga tapahi pepa whakarewa (whānui ≦6mm), kei reira te tapahi taiaho, te tapahi plasma, te tapahi mura, te kutikuti pereti maitai, te mīhini poka me ētahi atu. I roto i ēnei, ko te mīhini tapahi taiaho pepa whakarewa te tikanga tapahi hou i ngā tau kua taha ake nei, ā, kua tere te whanaketanga.
E toru marama ki muri, i pukumahi a Mr. Cagara o Pōrana ki te kimi i te kaiwhakarato waeine whakamatao wai ahumahi whai tohu. Ā, ināianei, kua uru mātou ki te hononga pakihi roa me tana kamupene, ā, kua noho hei kaiwhakarato whakamatao i roto i te rārangi kaiwhakarato.
Nō reira, i te wā e whakamahia ana te wai whakamatao ahumahi hurihuri, ka tūtohutia kia whakamahia e ngā kaiwhakamahi te wai parakore, te wai parakore rānei hei wai hurihuri.