Fit For Humidifiers: -comfort demineralization cartridge for humidifier is not only 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 with etc.. Compare to humidifier demineralizer UHE-HDC4. Evaporative, cold and warm mist humidifiers can drop humidifier filter in, too. Easy to : Simply drop it in tank, for , pure mist. Replace cartridge 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 . Size: Approx.4.6x2.3cm/1.8x0.9in Colour: blue Material: plastic Package Contents: 20 * Humidifier Tank Cleaning Cartridge Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.