The PuROTwist TQ56-36FC reverse osmosis (RO) membrane reduces a high percentage of total dissolved solids (TDS) and inorganic contaminants to provide safer, healthier drinking water. This membrane will improve the taste and quality of the water in your home for drinking, cooking, and making beverages like coffee, juice, and tea. The TQ-36FC has outstanding TDS rejection and is ideal for reducing dissolved inorganics and heavy metals from drinking water.