Nano filter (For NCCO Air Sanitizing System for Car/Desktop) NCCO Filter with Excellent Efficiency Decomposes VOCs, bad odors, Ammonia and Hydrogen Sultide Easy Maintenance and Durable The filter will last up to 3 years and is easy to replace. What is the working princple of NCCO? Pre-filter screens the pollutants and filter dust in the air. At the same time, Active Oxygen Generator will supply enough Oxidants and it will enter the nano pores of the nano filter with the pollutants. Pollutants and virus will be locked inside the nano pores and decomposed oxidized into non-harmful substances, such as water and carbon dioxide. NCCO Filter with Excellent Efficiency Easy Maintenance and Durable