Humidifiers add moisture to the air to relieve discomfort caused by dry air. Humidification also helps some people with respiratory disorders breathe more comfortably. Some types of humidifiers can spread bacteria and other waterborne contaminants into the air. Tap water can lead to a crusty white powder called "scale" inside the device. Scale comes from minerals in water. Use distilled water in humidifiers to avoid scaling and inhibit bacterial growth.

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