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RO (Reverse Osmosis) membrane is a semi-permeable membrane used in the process of reverse osmosis to purify water. It works by allowing water molecules to pass through while blocking the passage of larger molecules, ions, and contaminants. In reverse osmosis, pressure is applied to the side of the membrane with the concentrated solution (the feedwater), forcing water molecules to move from the more concentrated side to the less concentrated side (permeate side). This leaves behind contaminants and impurities, resulting in purified water on the other side of the membrane.RO membranes are commonly used in various applications, including residential water filtration systems, industrial water purification, desalination of seawater, and wastewater treatment. They play a crucial role in providing clean and safe drinking water and are an essential component of many water treatment processes.