The Omnipure (Q5486) is a mix of granular activated carbon and crystalline polyphosphate (slow dissolving) filte. This filter features the optional Twist Tap in-head valve system, which automatically turns the supply water off when the body is disconnected from the head. This filter can be used in ice makers, refrigerators, beverage equipment, drinking fountains, under the sink systems, and reverse osmosis systems. This filter is used to prevent scale deposits and precipitation for applications including Ice Machines, Coffee Makers, Distillers, Hot Water Heaters, Evaporators & Steam Generators.