S7028 Microline Replacement Filter CartridgeThe Microline Clack S 7028 filter cartridge contains carbon block media as a prefilter in your reverse osmosis (RO) system. It reduces unpleasant taste and odor issues, as well as other chemical contaminants, prior to the RO membrane. It also makes for cleaner water by filtering dirt and sediment to the 5 micron level. This serves as an advance guard in the reverse osmosis process, easing the workload of the membrane and providing you with superior