RO (Reverse Osmosis) is a water filtration system that removes impurities from water by using a semi-permeable membrane. The membrane allows water molecules to pass through while blocking larger molecules such as minerals, chemicals, and other contaminants. RO systems are commonly used in water treatment to remove impurities and improve the quality of drinking water. They are effective at removing a wide range of contaminants, including bacteria, viruses, and heavy metals. RO systems can be used in both residential and commercial settings and are an essential tool for ensuring safe and healthy drinking water.