A semi-permeable membrane is used in a RO system, also known as a reverse osmosis system, to filter pollutants out of water. It works by exerting pressure on the water, pushing it through the membrane while removing pollutants like germs, viruses, dissolved salts, heavy metals, and other impurities. These pollutants are successfully filtered out by the RO system, leaving only clean, pure water behind. This technique is frequently used to enhance the flavour, aroma, and calibre of drinking water in homes, businesses, and other settings. It offers a dependable and effective way to get wholesome water for a variety of uses.