The first three stages remove chlorine, colors and odors; fourth stage reverse osmosis RO is the key to the entire filtration system, it effectively filters out heavy metal organics, VOCs, bacteria and other harmful substances in water. The last stage is a carbon rod filter element- to purify any residual odor and ensure the taste of the water. Includes all plumbing, counter-top faucet, Teflon tape, clips and connection to water main, drain, new filters, faucet. Also connects to local WiFi network (Pushbutton method) and iphone/android app tells when filters need to be ordered/replaced.Prefer to sell this to someone comfortable with installation. Manual not in the box.. This item is in the category "Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters". The seller is "naracat" and is located in this country: US. This item can be shipped to United States.