The Omnipure Q5420-P is a 1 Micron Carbon Block Water Filter with Phosphate Scale Inhibitor. 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 aids in the removal of cysts, scale, taste, odor and chlorine taste and odor.Omnipure Q5420-P Q-Series Water Filter Specs:Dimensions: 2.5" W X 8" LRating: 1 Micron RatingFlow Rate: .5 GPMMaximum Pressure: 125 PSIGMaximum Temperature: 100 FService Life: 6 Months or 1500 GallonsFiltration Media: Carbon Block with PolyphosphateReduces: Chlorine Taste & OdorReduces: Cysts (Cryptosporidium & Giardia)Reduces: ScaleFitting Size: This Q-Series filter is a replacement filter and must be used with an existing Q-Series head. The Q-Series heads are available in 1/4" Quick-Connect fittings, 1/4" NPT female threads, or 3/8" NPT female threads.