ZeroWater is not an ordinary water filter! ZeroWater delivers a unique 5-Stage Ion Exchange technology compared to conventional 2-Stage filtration. Enjoy the purest tasting water with a filter that removes 99.6% of TDS (total dissolved solids) from your tap water, such as Aluminum, Zinc, Nitrate, Fluoride and more! It is the only water filter that meets FDA standards for TDS in purified bottled water. This provides you with a pour-through, gravity fed filter certified by the NSF to reduce Lead and other heavy metals; such as Chromium 3 and 6.