Simple Usage and Maintenance: Measuring 2.2x 1.73inches, these cleaning fish are easy to use by simply placing them in your humidifier tank. They are chemical-free, making them a safe choice for your home environment. Purification and Mineral Reduction: The cleaning significantly reduces white dust caused by minerals such as calcium, , and magnesium in hard water, cutting down harmful substances growth by up to 99% and minimizing tank cleaning frequency. Enhanced Cleaning Performance: This humidifier cleaning fish not only prolongs the life of your humidifier's filter but also maintains water cleanliness, effectively preventing odors and improving water quality in your humidifier. Universal Compatibility: Suitable for nearly all types of humidifiers, including Ultrasonic, Cool Mist, Warm Mist, Evaporative, and Steam Vaporizer models, and even in fish tanks. For optimal performance, use two cleaning balls per tank every 30 days.