This filter with triple layers traps impurities for fresher, cleaner moisture in your home. It effectively traps dust, dirt and impurities and prevents particles from being re-released into the air. It is featuring an exclusive baking soda layer to deodourize the air. This product has antimicrobial protection to help prevent the growth and formation of bacteria and mold, effectively eliminating odors. To ensure better efficiency, a ''Color check'' indicator indicates when the filter needs to be changed.