The Culligan ZeroWater 5-stage filter is an advanced water filtration system that removes nearly all total dissolved solids (TDS) from tap water, including metals, chemicals like PFOA/PFOS, and other contaminants, to deliver the purest tasting water. It features a five-stage process for superior filtration and is IAPMO-certified to reduce various harmful substances, with replacement filters designed to be compatible with Culligan ZeroWater pitchers and dispensers.