Ka'idar fasaha ta RO ita ce a ƙarƙashin aikin mafi girma na matsa lamba osmotic fiye da maganin, RO ruwa kayan aiki zai bar wadannan abubuwa da ruwa bisa ga sauran abubuwa ba zai iya wucewa ta cikin Semi-permeable membrane.
Kayan aikin kula da ruwa ta hannu kamar yadda ake kira Tashar Ruwa ta Wayar hannu sabon samfuri ne wanda Injin Toption ya haɓaka a cikin 'yan shekarun nan.Tsarin kula da ruwa ne na wayar hannu wanda aka tsara kuma aka gina shi don jigilar ɗan lokaci ko gaggawa da amfani da shi a wurare daban-daban.