Replacement filterset CA-509/CA-509D: Prefilter + TRUE HEPA + Active carbon filter\n\n1. Prefilter \nCatches big dust particles such as: fluff, hair and skin scales of domestic animals. The prefilter lengthens the lifespan of the TRUE HEPA filter.\n\n2. Original TRUE HEPA filter with nanosilver coating / HEPA filter class H13 \nTRUE HEPA catches 99,97% of all floating particles and allergens such as scales of pets, dust mites, pollen, bacteria and viruses >0,3 microns. Nanosilver is a filter coating to which an antimicrobial agent is added in order to eliminate bacteria and viruses and to stop the growth of mould, mildew as well as odour creating microbes at the surface of the filter.\n\n3. Active carbon filter:\nActive carbon neutralizes smells, chemical substances, gases and smells, prevents growth of bacteria, viruses and mould.\n\nDepending on the use of the filters, they need to be replaced every 6/8-12 months.