ZeroWater filters out 99.6% of all dissolved solids for the purest tasting water. Rather than filtering with a conventional 2-stage system, ZeroWaters premium 5-Stage filtration process filters out virtually all Total Dissolved Solids (TDS) from your tap water (TDS refers to salts, metals including lead, chemicals, fluoride, minerals and runoff). This process removes suspended solids such as dust and rust that may make water appear cloudy. It then removes organic contaminants; pesticides, herbicides, Mercury, Chlorine, Chloramine, and stops bacteria from growing. Next organic compounds are extracted. Finally, it filters out inorganic compounds i.e. metals, nonmetals and radiological contaminants. ZeroWater is the only pour-through water filtration system Certified by the NSF for the reduction of both lead & chromium and other heavy metals, and delivers 000 TDS, equivalent to the FDAs definition (<10 ppm) of purified bottled water. Filter life can vary depending on water quality. Get More Out of Your Water.