Reverse osmosis (RO) in water purifiers is a purification technology that utilizes semi-permeable membranes. Under pressure, water moves from the high-concentration side to the low-concentration side of the membrane. While water molecules pass through the membrane pores, most dissolved substances and contaminants are blocked. This process effectively removes harmful substances like heavy metals, bacteria, viruses, and chemical pollutants. LESSO water purifiers employ high-precision RO membranes that can remove over 99% of impurities, guaranteeing safe and pure water quality. RO technology preserves beneficial minerals in water while ensuring its healthfulness, making it one of the most efficient and safe water treatment methods available today.