Don't make a bit of difference in my home
I put one in my tiny office and another in my living room to help with cigarette smoke and animal odors.  I have not noticed one bit of difference in the smell of my home since I put them in.  I gave them two months, and now of course, cannot return them.  There is absolutely no change in either room and both rooms have no change in the air quality.
Rating: 1 stars