Simple, Easy-to-Use Ultrasonic Foggers These brilliant little units make increasing moisture levels a doddle. All you need to do is place them in water (just below the waterline) and they'll produce an abundance of water vapour. The three-site version gets through 900ml per hour and the five site version does 1500ml per hour! To make things as easy as possible, purchase a float for the foggers to sit inside. These floats will keep the foggers at the right level, no matter how much water there is, allowing you to sit them in a reservoir tank or bucket. The Mist Maker 3 is recommended for rooms with two lights and the Mist Maker 5 is recommended for rooms with four lights. How Ultrasonic Technology Works The Mist Maker 3 and 5 both use ultrasonic technology to generate mist. Ultrasonic sound waves are high-frequency vibrations that are in a range that's too high to be perceived by the human ear. The ultrasonic ceramic discs that sit on the surface of the unit vibrate hundreds of thousands of times per second. This generates a standing wave in the water, which breaks the water surface tension and causes tiny water droplets to be released into the air as a fine mist. The ultrasonic ceramic disc in the Mist Maker is made of piezoelectric material, which means it can convert electrical energy into mechanical energy. When an alternating current is applied to the disc, it causes it to vibrate at a very high frequency. The vibration creates a high-pressure area in the water, which generates a cloud of tiny water droplets.