The active carbon filter for the LIFAair LA503 smart air purifier. Comes with 2 activated carbon barrels filled with 3.5kg of premium anti-acid activated carbon. The active carbon filter absorbs and filters out organic compounds such as formaldehyde. Your Smart Controller device will Realtime display the consumption % for filter need to replaced. Filters lasts for about 24 months (be affected by the air quality level in use).