Everydrop Filter 4 is the only filter approved by: Whirlpool Maytag Amana KitchenAid and Jenn Air brands. Certified to reduce 99% of lead as well as other potentially harmful contaminants everydrop® filters offer convenient filtered water for you and your family. Certified to reduce 31 contaminants[2] including lead pesticides and pharmaceuticals. For the cleanest water replace your everydrop® filter every six months (or 200 gallons). everyone® Ice and Water Refrigerator Filter 4 replaces W11256135 & W11311161