ʻO ke kumu o ka ʻenehana RO ʻo ia ma lalo o ka hana o ke kaomi osmotic kiʻekiʻe ma mua o ka hopena, e haʻalele nā mea wai wai RO i kēia mau mea a me ka wai e like me nā mea ʻē aʻe ʻaʻole hiki ke hele i ka membrane semi-permeable.