After buying this filter, I discovered the ionization feature, while I'm sure it must work as advertised, is really poisonous.(Look ozone up). In fairness makers do warn users. However, ultra violet light is state of the art as are the two other Hepa Reusable, (washable) filters. The noise level on low, for a bedroom is great if white sound helps block outside noises. Bottom line, ignore ozone unless you need to fumigate a room or empty apartment. Gave this baby three stars because of high price, not poor performance.
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