Instances where conventional treatment of water is not sufficient (seawater, high conductivity well waters etc.) reverse osmosis method which removes all unwanted minerals is utilized. Yielding pure water from membrane filtration.

Working principle of reverse osmosis are the membranes mounted in the device.

Water is forced with high pressure through the membrane pores. During this process water and some inorganic molecules can pass through the membrane while most unwanted materials are unable to pass. The passing water is called product water while water couldn’t pass which includes most unwanted materials and molecules is called concentrate water.