[REDUCE THE WHITE-DUST] This demineralization cartridge replacement aims to reduces mineral (calcium & lime) buildup and white-dust caused by hard water in ultrasonic humidifiers. Reducing calcium and lime buildup may help extend the life of the humidifier and facilitate routine maintenance [COMPATIBLE HUMIDIFIERS] Compare to demineralization cartridge UHE-HDC4, this cartridges not only suitable for HE-CM25, UHE-CM25, UHE-CM45, UHE-CM45B, UHE-CM65, UHE-WM70, UHE-OC1, UHE-OW14, UHE-WM16, UHE-WM65, UHE-WM85, but also works with more ultrasonic humidifiers (1 gallon tank or larger) [EASY TO USE] Simply drop 1 cartridge into water tank, then it works. for months of use. Replace cartridge every 30-40 fillings, depending on the water hardness Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:light blue Material:plastic Package Contents: 20 x Ultrasonic Humidifier Demineralization Cartridges / 10 x Ultrasonic Humidifier Demineralization Cartridges Only the above package content, other products are not included. Note: Light reflection 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.