We got a new puppy after not being dog owners for 20 years. Unfortunately, I was horribly allergic to him to the point I thought I was going to have to find a new home for him. As a last effort, I decided to try an air purifier. After researching the various products on the market, I decided to purchase an Alen Breathesmart. After 3 days, I knew it was helping and after a couple weeks, I am not suffering any allergy symptoms. Wonderful product! I highly recommend. I also like the follow up emails.