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The installed water filter sponge is optional and helps catch minerals from hard water. Please note that as substances in the water oxidize, it is normal to observe some discoloration. The filter can last up to a year, depending on the quality of the water and how often the humidifier is used. You can soak the filter in distilled white vinegar and then rinse it under warm water to clean it; or, you can opt to leave it out altogether.
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