Whole House 3-Stage Water Filtration System, 3/4 port with 2 valves and extra 1 year filter supply (2 sets, 6 pcs). 1st stage: Premium Quick-Connect 5 micron sediment filter. Dust, dirt, silt, sand, rust and scale particles are trapped here in a filter which also extends the life of the system. 2nd stage: Premium 10 GAC Granular Activated Carbon filter removes chlorine, radon, VOCs (volatile organic compounds) and other common chemicals. This filter also removes cloudiness, offensive odors, colors and unpleasant tastes. 3rd stage: 10 Premium CTO Carbon Block filter removes chlorine, VOCs (volatile organic compounds, including insecticides, pesticides and industrial solvent). Included 2 extra sets of filters as a. You need to change filters every 4-6 months. The Reverse Osmosis Revolution Whole House System easily attaches to house plumbing. This filtration system comes with regular 10 housing. Comes with extra 2 sets of filters (6 pcs). This is 3 stage water filter, not Reverse Osmosis system (Reverse Osmosis Revolution is our brand name). Designed & assembled in U. Additional links: filter set with standard Carbon Block (4 year supply, 24 cartridges): https://www.. com/dp/B07L4GXJXP? Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. We usually respond within 24 hours on weekdays. Thank you for shopping at our store. This item is in the category “Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters”. The seller is “alha129285″ and is located in this country: US. This item can be shipped to United States.