[Damage-free installation] Say goodbye to drilling and compatibility concerns. The simple plug-and-twist design makes it great for renters. It also guarantees a hassle-free, quick installation of this under sink water filter system. [NSF/ANSI certified] The under sink water filter is NSF/ANSI 42 certified to reduce chlorine, taste, and odor and NSF/ANSI 372 certified for containing lead-free materials. Besides, it can reduce PFAS, PFOA/PFOS. Every drop of water is clean and safe. [Healthy hydration] Our 5+1 stage advanced filtration technology reduces harmful substances and adds essential minerals. Drink with confidence, nourish your body, and live a healthier lifestyle. (NOTE: This system DOES NOT lower TDS value because it adds beneficial minerals to the water.) [Safe materials] The under sink water filter system is made from food-grade stainless steel that is rust-resistant, durable, and leak-proof. The system maintains water purity while providing long-lasting reliability. [Long-lasting service life] Unlock a year of pure, filtered water with our under sink water filter’s 12-month filter lifespan! No more constant replacement, just continuous peace of mind. TDS is not a professional way to measure the water quality. Essential Minerals, Calcium, Potassium, Sodium, Magnesium...These essential minerals are dissolved solids, PPM will not be dropping if you test with a TDS meter. Waterdrop undersink water filtration system is keeping all those minerals, but removes elements that are harmful to your body. Note: The activated carbon is made from natural coconut shells. Please confirm whether you are allergic to it. Waterdrop Stainless Steel Under Sink Water Filter System