Replacement filters for this system. Full 8 stage RO Filters Set 322110714777. Filter cartridges should be changed every 6-12 months under domestic conditions. Filter life varies and depends on the water source quality.The item "8 Stage 50GPD Residential PH+ Alkaline Mineral Reverse Osmosis System NSF Faucet" is in sale since Saturday, January 14, 2017. This item is in the category "Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters".usa" and is located in Tonawanda, New York. This item can be shipped to United States.