This filter drum is engineered with an increased amount of activated carbon to help eliminate odours and airborne Volatile Organic Compounds | In addition, a True HEPA filter captures common pollutants in the air | Compatible with all Small TruSens Air Purifiers | This combination filter has 3 levels of filtration to defend against odours | It includes an activated carbon filter, a True HEPA filter and a durable mesh prefilter | The activated carbon filter helps combat cooking and cleaning odours, and reduces airborne Volatile Organic Compounds such as ammonia, acetone and formaldehyde | True HEPA filter captures common pollutants | 360 degree filtration draws in air from all directions to collect pollutants from around the room | The filter is at the core of purifying your air and replacement is essential for your purifier to perform at its best | Replace every 12 - 15 months and replace the Odour & Volatile Organic Compound Filter Carbon Filter every 3 - 4 months (depending on usage) | Change indicator glows red on your air purifier when the filter needs to be replaced | Compatible with the all TruSens Small Air Purifiers