The smell of this filter that came out of the box was sickeningly sweet, so much so that I had to take the vacuum to another room. Then again, the musty closet I've put it in now smells great. The smell of the filter dissipated fairly quickly and we didn't notice it after a few weeks of cleaning. I can't say it's worth the extra five bucks over a regular filter, but if you're dealing with stubborn odors it might be worth a try.
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