Keep your filtered air clean with a replacement filter. Fits both Warm and Cool mist humidifiers from Crane. Features: -Demineralization filter cartridge -Filters water and eliminates white dust -Fits Crane Clean Control Warm and Cool Mist Humidifiers -Extends lifetime of your humidifier -Lasts for 1-2 months of 30-40 tank fillings -Helps to reduce white dust -Extends life of the unit -Replace every month if using daily