Air filter needs to be cleaned out possibly replaced but uv light works. Field Controls Trio 1000P Portable, a top quality 3 in 1 hospital grade HEPA air purifier, that dramatically & efficiently reduces particles, VOCs, & germs in the environment; therefore, keeping you and your family healthy at all times. Coverage: over 1000 sq feet. Patented PRO-Cell technology significantly reduces VOCs (by over 98% in just a few hours) and odors. The Trio 1000P Portable maximizes air purification by using a 4 stage filtration system that is fully electronic. An air purifier with a brain to tell you when the air needs great filtration and when it doesn't. Even has a quiet mode.