<p><b>Please note that this Undersink Water Filtration System cannot reduce TDS. </b><br></p> <p>If you need to reduce TDS, the Waterdrop RO System will be an excellent choice. For details, please search ASIN: B07P1XFYJP.</p> <p>TDS stands for total dissolved solids. It is composed of inorganic salts and a small amount of organic matter. This undersink water filter cannot lower the TDS value because it removes harmful substances while retaining minerals such as potassium, calcium, sodium, and magnesium, which are beneficial for your health.</p> <p><b>For separate faucet you already have</b></p> <p>WD-15UC system ( Search ASIN: B085G9T9TB ) would be a better choice if you want to install it to the separate faucet you already have. It comes with the 1/4" PE hoses. If your faucet hose size is 3/8", you need to buy the 1/4''–3/8'' converter fitting to help you connect the system. But if the hose size is 1/4", then you can connect with the system directly.</p> <p><b>What’s in the box?</b></p> <p>·Waterdrop Undersink Water Filtration System×1</p> <p>·SS304 faucet set×1</p> <p>·1/4’’ PE tubing×2</p> <p>·3/8’’–1/2’’ Convertor set×2</p> <p>·Feed water adapter×1</p> <p>·Self-tapping screws×2</p> <p>·Teflon tape×1</p> <p>·Drilling sticker×1</p>