Review on Greentech Environmental pureAir 500: The Ultimate Portable Air Purifier and Cleaner for Home, Office, and Bedroom, Ideal for Up to 850 Sq. Ft., Eliminates Stubborn Odors with Ease! by Nichole Morris

The air purifier was fine. The filtration comes from the bottom of the block and is very small. It does the job of filtering our 10x15 space, but it takes a while. The power cord is quite short so I had to use an extension cord. The O3 option is good for cleaning the air and making it odorless, but exposure to O3 is bad for health and your pets.