It is the best thing I have ever bought. Not only can my family breath better, it removes dust. We have 2 large dogs and even they breath better. We used to dust almost daily and now once a week does it. And there has never been much to dust after I purchased my purifier. It has been a real lifesaver. My siter has COPD and that is why I ordered it. I did not realize how much difference it would make in so many ways. I can breath better and the allergies have about disappeared. My grandkids remark how good it feels and smells in my house since I have it. LOVE IT! I would recommend to everyone. I purchased the one that is for 800 square feet and put it in my living area. It works all over. Thanks