Ko te pereti he kowiri tira te ingoa whanui mo te pereti maitai kowiri me te paraharaha maitai maitai waikawa, me te papa maeneene, kirihou tiketike, pakari me te kaha miihini, me te aukati i te waikawa, hau kawakore, otinga me etahi atu papaho. He momo maitai koranu e kore e ngawari ki te waikura, engari kaore e tino waikura. Ko te pereti he kowiri tira e pa ana ki te paraharaha aarai waikura parakore i te reo ngoikore penei i te haurangi, te korohū me te wai, ko te pereti maitai waikawa waikawao e pa ana ki te paraharaha aarai waikura i roto i te rauropi haumanu rite te waikawa, te alkali me te tote.