Enhance-Ion™ works with your HVAC System filter to agglomerate smaller particles into larger particles to increase filtration efficency. Enhance-Ion enhances the ability of the HVAC filter to capture airborne contaminants and pollutants such as PM2.5 (Fine particulate matter less than 2.5 microns in diameter), as well as airborne contaminants and pollutants effectively turning a standard filter into a high-efficiency filter.