Humidifier Cleaner - Works with almost all humidifiers, including the following types of residential humidifiers and evaporators: ultrasonic, cool mist (turbine), warm mist, vaporizers, and steam vaporizers. Also suitable for aquariums Removes mineral buildup - Clean filter helps prevent and reduce white dust caused by minerals in hard water. This hard water “dust” may contain calcium, lime or magnesium Purified Water - Reduces odors causing harmful growth by up to 99%, keeps your humidifier mist clean and reduces tank cleaning time. EASY TO USE - Just put it in the box for a cool, pure mist. Replace ink cartridges every 30 days. This humidifier tank cleaning ball is free of harsh chemicals