A complete and reliable seven-stage reverse osmosis model with a pump and an 11-liter storage tank for under-sink installation in the kitchen. Reverse osmosis is the best method for purifying tap water. The eight stages of filtration in the system achieve effective reduction of up to 97% of the following elements: Chromium, Chlorine, Arsenic, Ammonia, Copper, Mercury, Uranium, Pesticides, Phosphates, Bacteria, Barium, Benzene, Dichloroacetic acid, Boric acid (boron), Bromide, Cadmium, Calcium, Carbon dioxide, Carbontetrachloride, Chloride, Color, Cyanide, Cyptosporidium, Fluoride, Giardia Lamblia. Also, Hydrogen sulfide, Iron, Molybdenum, Legionella, Magnesium, Manganese, Mercury, Methane, Nickel, Nitrate, Nitrite, Odor, Organic compounds, Potassium, Radon, Radium, Selenium, Silica, Silver, SOC, Sodium, Strontium, Sulfate, THM, TOC, Dissolved solids, Turbidity, Viruses, VOCs, etc.