ONLY Compatible Replacement Filters for SimPure Y7T Series (Y7T-BW-A,Y7T-BW-C, Y7T-A, Y7T-C) Countertop RO water Filter System It is commended to replace the SimPure RO Filter Every 6 months to ensure the quality of the water. (Due to the difference in feed water quality, the above is estimate) And the RO Smart Indicator Light will light up to remind you replace the filters QUICK CHANGE & NO TOOL: The twist-in filter system makes the filter replacement a breeze and no tools required. The no tool replacement save your time and energy Latest Anti-Counterfeiting Technology: Our product is equipped with cutting-edge anti-counterfeiting technology SERVING USA SINCE 2006, Seattle, WA USA, SimPure dedicated in providing world-class quality of water filtration solutions. If you are not satisfied with your purchase, then we want to hear from you. Please contact our trained water specialists. And is available to answer any questions during the life of the product SimPure Y7T Series RO Filter Replacement Cartridge for Y7T, Y7T-BW-A, Y7T-BW-C, Y7T-A, Y7T-C 6 Months Replacement Cartridge, 100 GPD (1 Pack)