Water filter model WF3CB creates higher quality water for consumption and operates with Frigidaire refrigerators. The Frigidaire PureSource3 filter is the factory original OEM to the WF3CB model. This factory original filter has been through extreme testing by NSF International to ensure the best filtration for public and environmental safety. Frigidaire's WF3CB was certified by NSF against Standard 42 and Standard 53. By passing these International Standards, this filter ensures a high level of filtration against chlorine taste, odor, particulate, lead, cysts, turbidity and other potentially harmful chemicals found in your water supply. This filter features an easy installation system and should be changed at least once every six months. Such a changing regimen will ensure an optimal flow rate and the highest quality water & ice.