Reverse osmosis is a technology that uses pressure to push water through a semi-permeable membrane to remove the vast majority of contaminants. Reverse osmosis can remove up to 99 percent of dissolved salts (ions), particles, colloids, organics, bacteria, and pyrogens from feed water. Reverse osmosis is a method of purifying water by removing salts and other impurities in order to improve the fluid's colour, taste, or properties. RO Typically used for drinking water purification, water and wastewater purification, food processing, and hydrogen production.