The Cuno 56077-03 SF18S Scale Inhibitor is a cartridge designed to prevent scale buildup in cold water systems. It effectively inhibits the formation of mineral deposits like calcium and magnesium, protecting pipes, appliances, and equipment from damage and ensuring efficient water flow. This cartridge is specifically designed for cold water applications with a flow rate up to 6 GPM a... https://partsfe.com/56077-03-sf18s-scale-inhibitor-cold-water-6-gpm-3-4-npt-max-100-f-replacement-h1315