Ko te miihini whakamuri osmosis ( Ro machine ) he miihini wai parakore e whakawhiti ana i te wai mata ma te tātari pai.Ko te osmosis whakamuri he momo hou hou o te hangarau maimoatanga wai parakore.Na roto i te huānga whakamuri osmosis hei whakapai ake i te ma o te kounga o te wai, tango i nga poke me te tote kei roto i te wai.Ko ta maatau miihini RO te nuinga e whakamahia ana mo te hemodialysis, te hohipera, te taiwhanga.