I ordered this air purifier from PIDOIM because I read that negative ions help to cheer you up. I have placed these purifiers in two of my bedrooms in hopes that inhaling negative ions while we sleep will benefit our mental health. I've researched "negative ions" and found a lot of good, reliable information. The cleaners are quiet and I believe they help us feel more awake. In my country these days I can use any help I can get. I am satisfied with these air purifiers.
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