Clarifion DSTx is a powerful, compact air purifier that works with any US outlet. The secret behind its effectiveness is a patent-pending True HEPA filter. First, it clears out 99.7% of harmful airborne particles then the carbon-composite technology built into the filter scrubs the air of nasty odorants. Plus, since the filters are so compact, they're far more affordable to replace than traditional HEPA filters while functioning just as well for just as long. In fact, this pack of 3 replacement filters can keep your air clean for up to a year, if not longer. Compared to a lot of “big name” air purifiers, this level of efficiency is practically unheard of. For use with Clarifion DSTx air purifying devices only.