Certified to reduce 99% of lead as well as other potentially harmful contaminants1, Everydrop filters offer convenient, filtered water for you and your family. For the cleanest water, replace your Everydrop filter every 6 months (or 200 gallons). Everydrop Ice & Water Refrigerator Filter 4 replaces W11256135 & W11311161. NSF certified to reduce 31 contaminants including lead, pesticides and pharmaceuticals. Fits bottom mount and side-by side in the interior for Whirlpool, Maytag, Amana, Jenn-Air and KitchenAid refrigerators. Reduces chlorine taste and odor. Filters asbestos, benzene, carbofuran, cysts, lead, mercury, p-dichlorobenzene, particulates (Class 1), toxaphene, and turbidity.