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How often do I need to replace the water in a humidifier?

While the humidifier's purpose is to make the air in your home healthier and more breathable, failing to replace the water in ...
WCVB Channel 5 Boston

Consumer Reports: How to make your humidifier more effective

GROSS, POTENTIALLY SPREADING BACTERIA AND OTHER GERMS. CONSUMER REPORTS REVEAL SOME SIMPLE AND EFFECTIVE TIPS TO KEEP YOUR HUMIDIFIER IN TOP SHAPE ALL WINTER. HUMIDIFIERS CAN’T PREVENT COLDS OR THE ...