This filter provides enhanced air purification and transforms your Arete One dehumidifier into a combined dehumidifier and air purifier. The H13 HEPA filter is used in addition to the included pre-filter, giving you a two-stage air purification system. The HEPA filter helps remove mold spores, pollen, dust, pet hair, dust mites, and more from the air. This is a so-called True HEPA filter (filter class H13), which means it meets strict international standards and captures 99.97% of particles that are 0.3 micrometers or larger in diameter. The Meaco Arete One 10L dehumidifier features a mode specifically for air purification, which can be used during months when the indoor air does not need to be dried. Additionally, the air is purified during the dehumidification process. This allows the Arete One to be used effectively throughout the year.