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Your humidifier may make white dust when it runs. We'll explain what the white dust is and how to eliminate it from your home.
www.hvac.com
What is white dust?
White dust is usually caused by mineral content in the water that goes into a humidifier. When the mist lands on furniture or other surfaces and dries, it can sometimes leave behind the dried mineral deposits, or “white dust”. For most people, the white dust is nothing to be concerned about; however, it could be problematic for some people with allergy, asthma or other lung/sinus health conditions.