The Celios SoClean Advanced Air Purifier contains 3 different filters, each with their own unique purpose, for much better and cleaner air. The core filter is designed to capture ultra-fine particulates down to 10 nanometers in size. The pre-filter removes larger air pollution particles including dust mites, pet dander, pollen and mold spores. The carbon filter is an oversized filter containing activated coarse carbon which removes volatile organic compounds (VOCs), gases and odors. This air purifier captures particles up to 30 times smaller than those captured by HEPA filters.