I bought this for my wife, because she has been suffering with sinus issues for years. She also has asthma, and we have indoor pets. We put the air filter on her side of the bed, and within just a few days, she was symptom-free. It has also has helped both of us with snoring at night. This filter will be a part of our life from now on. We have even decided to take it with us when we travel. Thank you so much!