The Berkey removes 99.9% - 99.9999% of the following common contaminants from water and more: Viruses; Pathogenic Bacteria such as E. Coli, Giardia, Cryptosporidium, and more; Chlorine; Pesticides; Sediment; Detergents; Heavy Metals; Pharmaceuticals such as Acetaminophen, Caffeine, Ibuprofen, Naproxen Sodium, Progesterone, and more; Petroleum Contaminants such as Gasoline, Diesel, Crude Oil, Kerosene, and more; Fluoride and Arsenic (with the use of additional fluoride filters)