Zerowater, 2 pack, replacement filter for pitchers, great tasting water with the latest filter technology, 5 sophisticated technologies that work together to remove virtually all dissolved solids from your tap water, delivering you great tasting water, certified by the nsf to reduce lead, first layer of filtration, activated carbon & oxidation reduction alloy removes the chlorine taste you are accustom to with tap water, ion exchange stage removes virtually all dissolved solids that may be left over from public water systems or even leached into your water from piping such as aluminum, lead, zinc, nitrate & more, three additional stages are included to remove other impurities & to ensure your water receives the appropriate amount of treatment time to deliver a "000" reading on your laboratory grade total dissolved solids meter included.