Dr. Filter is a simple whole-building solution that treats your air. You have probably been spending a lot of money on additional cleaning services. Or maybe you are considering an expensive complicated air purifier technology system. Upgrading your filters can make sense, but HEPA-rated filters can really tax your HVAC systems and shorten their life. Our simple service consists of spraying Dr. Filter onto your existing Merv-rated filters when you do the 90-day filter rotation.