4-pcs Ionic Air Purifier Black Aluminum with 2-Year Warranty

The worked ok for the first 2 years. Now that the warranty is up, they make a loud noise and can hear them all through the house. Disappointing

Appears to be working. Husband and cat are better. Not as much sinus spray and congestion is a heck of a lot better.

Didn’t see a difference and they started making loud noises