For constantly clean air with the Soehnle Airfresh Wash 500 air washer: The replaceable, high-quality pre-, EPA and activated carbon filters collect pollen, dust, bacteria, viruses and ultra-fine particles up to 0.3 µm. Even unpleasant smells and gases are filtered from your air. In order to maintain the high cleaning performance, the filter display indicates that a filter change is required after approx. 1,000 operating hours. It is quick and simple to remove and put back in.