The HealthWay Deluxe uses patented Disinfecting Filtration System (DFS) technology to achieve the highest filtration efficiency of any air filter on the market. This technology works by running an energy wave through the air to kill up to 99.97% of all viruses, bacteria, mold and fungi. Most air purifiers use UV light to do this, but this method isn’t nearly as efficient and can cause harmful side effects, like lung irritation and coughing. In contrast, the DFS technology is incredibly safe, efficient and exceeds the U.S. government’s HEPA standards.