The Omnipure Q5685 is a water filter with phosphate scale inhibitor. The Omnipure Q5685 Scale Inhibitor water filter is very user-friendly. Replacement of the spent media bed is done quickly by detaching the filter body from a permanent head with a twist of the wrist. The new Q5685 filter body is just as easily threaded into the head and the replacement is then complete. The Omnipure Q5685 is also available with the optional Twist Tap in-head valve system, which automatically turns the supply water off when the body is disconnected from the head. The Omnipure Q5685 filter is used to prevent scale deposits and precipitation for applications including Ice Machines, Coffee Makers, Distillers, Hot Water Heaters, Evaporators andamp; Steam Generators. The Omnipure Q5685 is a crystalline polyphosphate (slow-dissolving) filter with 20 micron polyspun postfilter.