Reverse osmosis is the best method for purifying tap water. The system's eight filtration stages achieve a significant reduction of up to 97% of the following elements: Chromium, Chlorine, Arsenic, Aluminum, Ammonia, Copper, Mercury, Uranium, Pesticides, Phosphates, Bacteria, Barium, Benzene, Bicarbonate, Borate (boron), Bromine (bromide), Cadmium, Calcium, Carbon dioxide, Carbon tetrachloride, Chloride, Color, Cyanide, Cryptosporidium, Fluoride, Giardia Lamblia. Also, Hydrogen sulfide, Iron, Lead, Legionella, Magnesium, Manganese, Mercury, Methane, Nickel, Nitrate, Nitrite, Odor, Organic substances, Potassium, Radium, Radon, Selenium, Silicon, Silver, SOC, Sodium, Strontium, Sulfate, THM, TOC, Dissolved solids, Turbidity, Viruses, VOCs, etc.