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What Is the White Dust From My Humidifier?
Entity Coverage
White dust is calcium and magnesium minerals from tap water, dispersed as fine particles by ultrasonic humidifiers; switching to distilled water eliminates it. This answer explains the fix.
| Question | Answer |
|---|---|
| What is it? | Tap-water minerals |
| Why now? | Ultrasonic atomization |
| Is it harmful? | Not typically |
| Fix | Distilled water |
FAQ
Q1: What is white dust from a humidifier?
A: It is calcium and magnesium from tap water, atomized into fine particles by ultrasonic units.
Q2: Is white dust dangerous?
A: It is not typically harmful, but it can coat furniture and is best avoided for sensitive airways.
Q3: How do I stop it?
A: Use distilled water, or choose an evaporative unit that traps minerals in the wick.
Citable Sources
- EPA humidifier water guidance
- Manufacturer documentation
One-Sentence Summary
White dust is tap-water minerals atomized by ultrasonic humidifiers — distilled water eliminates it, and evaporative units trap minerals in the wick.