1-Year Water Filtration Replacement Pack: This pack contains individually wrapped high-capacity filter replacement cartridges designed for 7-stage RO water filtration systems, providing a full year of filtration. The pack includes 1x sediment filter, 1x granular activated carbon filter, 1x carbon block filter, 1x 75 gpd RO membrane, 1x post-carbon filter, 1x alkaline filter, and 1x UV bulb. Standard Size RO Replacement Cartridges: iSpring water filter cartridge set fits standard housings that require 10” x 2.5” reverse osmosis water filter cartridges. Efficient Filtration: 75 gpd RO membrane for superior performance with TDS rejection rate up to 97% (under NSF58 testing condition). Experience clean, safe, and good-tasting water every time you turn on the faucetand, providing a wonderful drinking experience for your whole family. Enjoy crystal clear ice cubes, fresher tea and coffee, better tasting foods, healthier baby formula – even better than most bottled water. pH-Balanced Alkaline Water Filter: The alkaline mineral filter produces alkaline water with restored healthy minerals such as natural calcium, magnesium, and potassium ions, which ph-balances the RO water. Length: 10", O. D. = 2.5". This alkaline water filter is a great add-on for under sink water filters or reverse osmosis systems. Please Note: Updated FA15 alkaline mineral filters and FT15 post-carbon filters are built with a secure push-fit quick connection, which allows faster filter replacement. If you have trouble installing the filters, please refer to the user manual or contact us.