He koho maikaʻi loa nā membrane kānana hoʻomaʻemaʻe wai home no ka wai maʻemaʻe ma ka home. Hiki iā lākou ke wehe pono i nā mea haumia like ʻole e like me nā metala kaumaha, nā bacteria, a me nā kemika ʻino, e hōʻoiaʻiʻo ana i ka wai inu palekana a olakino. He paʻa kēia mau membrane, e hōʻemi ana i ke alapine o nā hoʻololi. He maʻalahi hoʻi ke kau ʻana, e kūpono ana i ka hapa nui o nā mea hoʻomaʻemaʻe wai maʻamau. Eia kekahi, he kūpono ke kumukūʻai, e hāʻawi ana i ka mālama kālā lōʻihi ma ka mālama ʻana i ka wai.