Features: The Clean Mists Cartridge effectively reduces contaminants build up in humidifiers, ensuring healthier mists by removing over 99% of minerals and impurities to prevent white scale and maintain optimal indoor air quality. Featuring multilayer composite filtration technology, this plastic filter cartridge offer extended 3 month lifespans with easy cleaning and robust resistance to water damage for stable humidifier performances. Designed for families, especially those with infants, this humidifier filter provides safe, mists to protect respiratory health and create a healthier living environment for sensitive users. Ideal for use in bedrooms, living rooms, and offices, this cartridge enhances comfort by efficiently humidifying dry air during winter or in heated spaces, improving overall air quality and well being. With its user friendly replacement design and compatibility with HM311/311S/524/524S/306 models, this filter cartridge simplifies maintenance while delivering consistent mists for long term reliability. Specifications: Component: Plastic Size: Approx. 5.90inch(15cm) Applicable Model: For HM311, HM311S, HM524, HM524S, HM306, HM409S Package Includes: 3x Humidifier Filter note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.