Premium 5 Stage Filtration: Removes 99 percent of total dissolved solids (TDS) for the purest tasting water; TDS are organic and inorganic materials such as pesticides, metals including lead and mercury, minerals, salts, and ions NSF certified and BPA free: The Only Pour Through Filter NSF Certified to Reduce Lead, Chromium and PFOA/PFOS; All material is BPA free