This Kit includes total 12 filters + 1 reverse osmosis membrane, water storage tank, faucet. 4 x Polypropylene Sediment Filter, 3 x GAC Activated Carbon, 3 x CTO Coconut Shell Carbon Block Filter, 2 x InlineT33 GAC Coconut Shell Carbon Filter Features: Offers up to 50 Gallons Per Day in bottled water quality. Refreshing, Crisp Taste Superior to Bottled Water Very low maintenance, just change Ultimate pre-filters as recommendation. Can be attached to the kitchen tap or installed under sink. System only to be used on biologically safe water supply. Quick connect fittings for easy installation. Efficient to reduces: copper, lead, fluoride, cadmium, selenium, arsenic, cysts ,barium, trivalent chromium, copper, lead, fluoride, Odor, TDS many more. Dimensions: RO Unit 13 1/2" x 4 15/16" x 17 5/16" Operation Temperature: 37°F to 104°F / Maximum temperature 40°C. System Operating Pressure: 45PSI to 75PSI. Providing safe & clean drinking water with WQA Gold Seal Certification after passing strictly tests of material safety, structure integrity, function & authenticity Specifications: 1st Stage-Polypropylene filter: High-Grade 1 micron high-capacity polypropylene sediment filter remove larger particles & suspended matter such as dirt, silt, rust, sand from water. Protects and extends the life of the membrane and system Recommend replace every 6 months, varies depend on the water source quality Standard Size 2 11/32" x 10" 2nd Stage-GAC Activated Carbon: Remove of deep-seated particulate impurities,sludge,rust other suspended matter, color adsorption, odor, pesticides, detergents and other organic pollutants Recommend replace every 6 months, varies depend on the water source quality Standard Size 2 3/4" x 10 1/4" 3rd Stage-CTO Coconut Shell Carbon Block Filter: Forceful remove pesticide residues in water, water pollution odor of ozone, chlorine removal of residual heavy metals, rate if 99% Recommend replace every 16 months, varies depend on the water source quality Standard Size 2 3/4" x 10" 4th Stage-Reverse Osmosis membrane: RO membrane pore size is the hair of five millionths(0.001 microns) it can effectively remove calcium and magnesium, bacteria, organic, inorganic, metal ions and radioactive substances. Recommend replace every 4 years, varies depend on the water source quality Standard Size 2 3/16" x 11 13/16" 5th Stage-Inline T33 GAC Coconut Shell Carbon Filter: T33 GAC Coconut Shell Carbon Filter removes any taste or odor Recommend replace every 6 months, varies depend on the water source quality Standard Size 2 11/32" x 9 13/16" Water Storage Tank: 3.2 Gallon Tank Work pressure: less than 0.4MPa Pressure Max: 1.3MPa Flow: larger than 3L/min Dimension: 15" x 10" NSF approved Premium Faucet: Longer life span Modern Style Deluxe Faucet Drip-free Size of Faucet Mouth(Dia.): 5/16" Dimension: 5" x 11" Package Includes: 1 x 50 Gallons 5-stage Reverse Osmosis System 4 x Polypropylene Sediment Filters 1x Water Filter System 3 x GAC Coconut Shell Carbon Filters 3 x CTO Coconut Shell Carbon Block Filters 2 x Inline T33 GAC Coconut Shell Carbon Filters 1 x Reverse Osmosis membrane 1 x Water Storage Tank 1 x Faucet 1 Set Installation Hardware 1 x Manual Note: 3.2 gallon storage tank is used for stabilizing water pressure, so it is normal that it can not be fully filled.