Application - The humidifier cleaner fish is suitable for most evaporative humidifiers, ultrasonic humidifiers, cool mist humidifiers, aquariums and humidifier wick filters. Just put it in the slot and start working. Performance - Fish tank humidifier The tank cleaner fish has excellent performance. It does not contain any irritating chemicals and has excellent cleaning function. It can extend the life of the humidifier's absorbent filter and keep the air clean. Improve the quality of the humidifier's performance. Prevent unpleasant odors and tastes. Usage - You only need to put the humidifier cleaning box into the humidifier to keep the air tank clean for a longer time. It is recommended to use clean water and replace the humidifier cleaner every 30 days. Note - The opening diameter of the humidifier should be at least 1.8 inches. Please check if the humidifier opening is large enough to fit universal humidifier cleaners. Excellent Performance - Extend the life of the humidifier