Instead of carbon filtering only, our filters use Ion Exchange Technology to reduce contaminants. ZeroWater® filters are the only pour-through filters NSF Certified to remove chromium & lead. Our pitchers, tumblers, & dispensers remove virtually all solids for the purest tasting water. ZeroWater® filters filter water in 5 stages and are NSF certified to reduce lead and other heavy metals. Zerowater® removes 99.6% of total dissolved solids, 2X more than the leading brand (tested by independent lab).