Air purifier HEPA filter, activated carbon filter and pre-filter in a cartridge The heart of any air purifier is the filter system, which removes odours, bacteria or dust particles from the air and has a positive influence on air quality. The three-stage filter effectively cleans ambient air that flows through the air purifier and ensures a pleasant atmosphere in which even allergy sufferers can breathe easily. Compact—three filters in one cartridge for the air purifier UNI_HUMIDIFIER_05 Pre-filter—removes airborne bacteria, fungi and mould HEPA filter—removes ultrafine particles such as mould, spores or dust particles Activated carbon filter—neutralises unpleasant odours such as vinegar or smoke and eliminates volatile gases and fragrances Persistent—effectively cleans the air for up to three months