Product Description: 1. Cleanable Pre-Filter Traps large particles such as human hair, pet dander and dust particles. Helps to extend the life of the HEPA and Activated Carbon filters. 2. True HEPA Filter Traps up to 95% of allergens and airborne contaminants down to 0.3 microns in size. These allergens include lung damaging dust, mould spores, plant spores, pet dander and pollen. 3. Activated Carbon Filter Neutralises odours and Volatile Organic Compounds (VOC’s) such as formaldehyde and benzene, as well asother harmful fumes emitted by household products. How to use: Filter Replacement Indicator After 2,000 hours of use, the “Filter Reset” button light will flash during operation. This indicates that the filters in the air purifier need to be replaced. Replace the filters according to the instructions below. Then, press the Filter Reset button to reset the built-in filter replacement timer.