This product has to be one of the best investments I have ever made in my life. I don't have one bad thing to say about it. For anyone that deals with respiratory issues like myself, allergies, or just want overall good air quality, do yourself and your family a favor and purchase this Today! I have had family and friends buy this since the first 24 hours that I spent with mine. I have not slept better than I have in years! I can finally breathe and I don't feel like I'm constantly using my inhaler and nebulizer. Plus you can't beat this price.