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The Curious Bag
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<h4 class="dechead">On One Hand: More Sanitary
Evaporative humidifiers use a wicking filter to disperse moisture into the air, whereas ultrasonic humidifiers do not. The wicking filter tends to create areas of stagnant water which can be a breeding ground for harmful mold and bacteria. To prevent this, you must clean the humidifier daily.
On the Other: Minerals in Water Are Not Filtered
Ultrasonic humidifiers' filterless design prevent them from growing bacteria, but anything that is already in the water is put directly into the air. The most common problem, especially for people with hard water, is that the water's mineral content is deposited as white dust on nearby furniture.
Bottom Line
Ultrasonic humidifiers are less likely to spread bacterial or fungal sickness because of their design, but they can still make a mess if the water supply has a high mineral content.
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