tds ro plantA Total Dissolved Solids (TDS) Reverse Osmosis (RO) plant uses semi-permeable membranes to strip away 95% to 99% of dissolved salts, heavy metals, and minerals from raw source water. Managing and controlling the TDS level is the primary mechanism that allows an RO plant to transform brackish groundwater, municipal tap water, or salty borewell water into safe, palatable drinking water.