Used in Frigidaire, Kenmore, and other high-quality refrigerators across the industry, the WFCB water filter is of high-grade for its type. Going up against scrutinous testing by NSF International, an independent public testing organization for public and environmental health, the WFCB original OEM product by Kenmore faired more then adequately. The factory original WFCB graded out as certified to meet both NSF Standard 42 and Standard 53. Such certifications leave consumers at ease when it comes to reducing chlorine, lead, odor, cysts, turbidity, impurities, and other potentially harmful chemicals in their water supply. One won't have to wait long when filling up a beverage, as this WFCB OEM by Whirlpool dispenses water at a rapid rate of a half gallon per minute. To ensure optimal water flow, filters should be changed once every six months or when the water quality begins to decrease.