Fit For Most Humidifiers: Total-comfort demineralization 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 fresh, pure mist. Replace every 30 days.This humidifier tank cleaning ball contains no harsh chemicals. Eliminates Mineral Build-up: The Cleaning helps to prevent and reduce the white-dust caused by minerals in hard water. This hard-water"dust"can contain calcium, or magnesium. 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 large enough to accommodate these humidifier filter. Purifies Water: Reduces up to 99% of odor causing harmful substances growth. Keeps your humidifiers mist clean and less tank cleaning times. Size: .4.6x2.3cm/1.8x0.9in Colour: blue Material: plastic Package Contents: 20 * Humidifier Tank Cleaning Only 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.