This WFCB refrigerator model is manufactured as a factory original OEM product by Frigidaire. The factory original OEM by Frigidaire for model WFCB has been tested by NSF International to make sure the product is adequate for public usage. The result: Frigidaire's WFCB passed testing against Standard 42 and Standard 53. These tests reveal just what a high-quality filter Frigidaire has produced. This filter protects your water supply from unwanted chlorine, turbidity, cysts, particulate, and other potentially harmful chemicals. Utilization of this filter will lead to clearer ice and cleaner drinking water. This filter should be changed at least once every six months to ensure optimal filtration performance and flow rate. Failure to properly change a filter on time may result in potentially harmful contaminants finding their way into your drinking water.