Compatible with legacy ZeroWater pitchers and dispensers. Effectively remove non-organic and organic sediments and contaminants from everyday tap water with this ZeroWater Replacement Filter. Its patented ion exchange technology incorporating a five-stage filtration system combines five sophisticated technologies that work together to remove 99.6% of all total dissolved solids (TDS). It is certified by the global public health and safety organization NSF, to reduce microplastics exceeding three microns in length, the forever chemicals PFOS/PFAS by 95% along with lead, and chromium to deliver the purest tasting water. Pack of 4. Meets the FDA definition for purified bottled water. Activated carbon infused micron cloth. Multi-layer filtration.