Fit For Most Humidifiers: -comfort demineralization cartridge for humidifier is not only compatible with 0.5-gallon ultrasonic humidifiers UHE-CM65, UHE-WM70, UHE-OC1, UHE-HDC4, UHE-CM45B, UHE-CM25, UHE-WM16, UHE-OW14, UHE-WM85, but also compatible with etc.. Compare to humidifier demineralizer UHE-HDC4. Evaporative, cold and warm mist humidifiers can drop humidifier filter in, too.Easy to Use: Simply drop it in tank, for , pure mist. Replace cartridge every 30 days.This humidifier tank cleaning ball contains no harsh chemicals.Eliminates Mineral Build-up: The Cleaning cartridge helps to prevent and reduce the white-dust caused by minerals in hard water. This hard-water"dust"can contain calcium, lime or .Note: The opening diameter of the humidifier should be at least 0.9 inches (approximately 2.3 cm). Please check if your humidifier opening is enough to accommodate these humidifier cartridge filter.Purifies Water: Reduces up to 99% of odor causing harmful substances growth. Keeps your humidifiers mist clean and less tank cleaning times.Size: Approx.4.6x2.3cm/1.8x0.9inColour: blueMaterial: plasticPackage Contents:20 * Humidifier Tank Cleaning CartridgeOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.