Why do you choose Waterdrop? Established in 2015, Waterdrop has grown to become the most popular and diversified brand in the replacement filter industry. Please note that this Undersink Water Filtration System cannot reduce TDS. If you need to reduce TDS, the Waterdrop RO System will be an excellent choice. For details, please search ASIN: B07P1XFYJP, B082CZ9XZ9, B082D177MX. TDS stands for total dissolved solids. It is composed of inorganic salts and a small amount of organic matter. This filter cannot lower the TDS value because it reduces harmful substances while retaining minerals such as potassium, calcium, sodium, and magnesium, which are beneficial for your