ZeroWater's Replacement Filter, with patented ion exchange technology incorporating a 5-stage filtration system, combines FIVE sophisticated technologies that work together to remove 99.6% of all total dissolved solids (TDS), the non-organic and organic sediments and contaminants found in our everyday tap water. ZeroWater's filtration is also the only system independently certified by the global public health and safety organization NSF to reduce microplastics exceeding 3 microns in length, the forever chemicals PFOS/PFAS by 95% along with lead, and chromium to deliver the purest tasting water.