One of the most complete water filter systems on the market, our ProSeries reverse osmosis water filtering systems remove contaminants and balance the pH of your drinking water by adding necessary minerals back into your drinking water.  These RO systems have a 5 year warranty, one of the longest available for reverse osmosis systems.  If you have any questions or need more information about this 6 stage reverse osmosis system, contact our technical support, 1-888-309-2837, and they'll be able to get you the system you need. Reduce and Eliminate Water Contaminants: Arsenic, Chlorine, Lead, Mercury, Bacteria, Metals, Chloroform, Fluoride, Nitrates, TDS, Chromium-6, Pharmaceuticals, and Most Contaminants. 6-Stage Reverse Osmosis Process: 1st: Sediment filter that reduces dirt, sand, silt, rust, and other particles.2nd: Granular Activated Carbon (GAC) that reduces chlorine taste, odors, and other unwanted chemicals that are present.3rd: Carbon Block Filter further reduces unpleasant odors and chlorine taste.4th: 50 GPD Membrane removes a wide variety of contaminants and impurities that includes heavy metals, total dissolved solids, bacteria, viruses, and many others.5th: Inline Post GAC polishes off any taste or odors that might be present in the storage tank.6th:Alkaline Mineral Filter - Re-mineralization of water and boosts pH 1.0 to 2.0Included with the alkaline reverse osmosis system: All Filters 50 GPD TFC Membrane 4 Gallon Tank Attractive Chrome Faucet All Tubing Needed For Installation Comprehensive 5 year warranty. This Pro Series 6-stage system is also one of the easiest to install and to change the filters. All items that are needed for installation come with the unit.