The more rapid the pace of work, the more obvious its existence. While I'm sure it would be noticeable at full throttle, I use it mostly on low and very occasionally on medium to increase humidity more quickly. Every time the tank is empty, I fill it up again since the water turns a distinct yellow color. Possibly rust, possibly dust. Drum cleaning will be reduced in frequency if water is changed often. I can't claim that air quality has improved; frankly, I didn't expect it to. As time went on, I saw that the robot vacuum's HEPA filter was getting cleaner.
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