Abstract: Salt water and other solutions are accelerated in a rotating structure and applied to a cannister containing reverse osmosis membrane material. The desalinated water is removed after passing through the large surface area concentration of membrane material in the cannister. The enriched brine is removed from the cannister at a point furthest from the axis of the rotating structure and returned to the vicinity of the axis to prevent the buildup of dense material. The membrane material is configured in the cannister so that the flow is generally radially with respect to the axis of the rotating structure.