Enjoy great-tasting water with the latest filter technology. The 2 Pack ZeroWater filtration system combines FIVE sophisticated technologies that work together to remove virtually all dissolved solids from your tap water, delivering you great tasting water.  These are the only pour-through filters on the market certified by the NSF to reduce lead. ZeroWater also removes 99% of Fluoride from tap water. Stage 1: Coarse filter to remove fine particles/sediment.  Stage 2: Distributor that maximizes contact time.  Stage 3: Multi-layer system using activated carbon and oxidation reduction alloy.  Stage 4: Comprehensive ION EXCHANGE array.  Stage 5: Non-woven membrane to remove fine particles.