Replacement filters for this system. Full 5 stage RO Filters Set 75 GPD 201955300307.Pre and post Filter Set: Sediment, GAC, CTO, inline Carbon 191729905484. Filter cartridges should be changed every 6-12 months under domestic conditions. Filter life varies and depends on the water source quality. The item "5 Stage Drinking Reverse Osmosis System With 20 Water Filters 75 GPD (2 Membranes)" is in sale since Friday, May 13, 2016. 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.