When looking to improve your health, start with the water you drink. This carbon block filter removes contaminants from your drinking water, including chlorine, cysts, lead, mercury, carbofuran, benzene, endrin and more. At the same time, it keeps minerals in your water which may be beneficial to your health. Tested and certified against NSF/ANSI standards 42 and 53, the filter also makes your water taste fresh and clean for up to six months or 300 gallons (1,136 L). This Best Buy essentials filter is a cheaper choice than expensive manufacturer brands. And it~s backed by Best Buy, so you can trust that your family~s water is safe. It~s easy to install and includes instructions to guide you. Enjoy great-tasking drinking water with the Best Buy essentials NSF 42/53 Water Filter Replacement for Select Whirlpool, KitchenAid and Sears/Kenmore Refrigerators.