ULTRAWF Frigidaire PureSource Ultra Refrigerator Water FilterULTRAWF Frigidaire PureSource Ultra Refrigerator Water Filter (ULTRAWF) The ULTRAWF Frigidaire PureSource Ultra refrigerator water filter is a genuine OEM part that will reduce contaminants ranging from chlorine to mercury for up to six months. This filter provides significant contaminant reduction, cool filtered water on demand, and can also help cut back on costly and wasteful water bottles. Enjoy only the purest, most refreshing water and ice by