FAQ For which complaints are air purifiers with activated charcoal useful? Air purifiers with activated charcoal - which pollutants do they filter out? For which complaints are air purifiers with activated charcoal useful? What are HEPA filters and what is the difference? What are the advantages and disadvantages of activated charcoal in air purifiers? What is the effect of activated charcoal filters? What is the effect of UV-C disinfection on pathogens? What is the effect of a negative ion generator? How does an air purifier with activated charcoal work? How often does the water in the humidification module need to be changed? How is health risk mitigated when using UV light?