If it is time to replace your refrigerator water and ice filter then the Frigidaire ULTRAWF Puresource Ultra replacement is the right choice. Designed specifically with the Frigidaire Pure Source Ultra side-by-side line of refrigerators in mind, the Frigidaire ULTRAWF is compatible with other brands that use filters of the same size and have cylindrical housings mounted on the interior ceiling. Once in place the activated carbon filter media allows water to move through the material where chlorine taste and odors are absorbed and impurities captured. Not only is the filter NSF Certified for Standards 42 and 53, but it also meets emerging standard 401 for the reduction of prescription and over the counter drugs sometimes found in water supplies. Keep your refrigerator filter in mind and replace as needed so you can always provide the best tasting and highest quality water to family and friends.