How to Prevent Humidifier Mold
Keep indoor humidity at 30% to 50%, empty the tank after every run, and clean every water-contact part at least once a week.
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How to Clean a Humidifier Tank
Clean a humidifier tank after every day of use, then deep clean it every 7 days, or sooner if you see white crust, slimy film, or a musty odor.
How to Choose How Often to Clean a Humidifier
Clean it every 3 to 7 days of active use, and tighten that to every 2 to 3 days if you run it daily, use hard tap water, or see mineral film.