[Floating ]The humidifier cleaning fish in the water keeps your humidifier clean and fresh. No harsh chemicals, Work with evaporative, ultrasonic, Warm & Cool Mist Humidifiers, Vaporizers, Steamers, and Fish tanks, and well for a humidifier wicking filter. [Reduce Mineral Buildup]Humidifier Clean helps eliminate "white dust" caused by calcium, and magnesium in hard water. Lasts for 30 days, reducing tank cleaning time. [Odor Removal]Humidifier Clean removes up to 99% of odorous substances and unsightly substances. One Clean can effectively to 2 gallons (about 7.8 liters) of tank capacity.Humidifier opening should be at least 1 inch diameter. Please check the opening of your humidifier whether it is large enough to fit these humidifier cleaner . [Easy to use]Put this cute clean into the humidifier water tank. It will float in the fish tank, in the humidifier. The center of of the can be adjusted by slightly shaking, so that the presents a different floating form. It is recommended to use 2 sharks per 1 gallon tank and replace every 90 days. [Excellent Performance]The active component of humidifier cleaner is mainly Silver ion. Humidifier tank cleaner can extend humidifier wicking filter life and keep the water clean. Prevent objectionable odors and reduce the number of cleanings. Material:plastic colour:blue Package Contents: 6 * Humidifier Clean 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.