3M Aqua-Pure Under Sink Replacement Filter Cartridge, Model AP517 (Pack of 1) No spills, no mess, fast, easy and sanitary cartridge change with 1/4 of a turn Protection against stressful conditions such as water hammer For higher dirt removal efficiency and longer cartridge life For long cartridge life and complete removal of unwanted chlorine and taste/odor To protect equipment and ice makers against scale buildup and the damaging effects of corrosion, reducing maintenance costs