We do not filter your air, we clean your air! Our mold cleaning system has been tested and proven by multiple labs. 12 Stones Mold Cleaning has 30 years experience in construction, and 5 years in inspecting, air-testing and removing mold thoroughly. With this experience, I am able to help educate you on what your situation is and the best solution. I use the Goldmorr System; originally designed for weapons grade Anthrax (99.98% effective in removing) and tested by Homeland Security but safe to use on anything in your house. It is a 2 part system with a spray used on surface mold that will even remove the mold stain on paint and bare wood(as in attics). The second part is a fogging system that cleans the air of mold spores, bringing them down to safe levels in 24 hrs. I want you to understand what caused your mold problem and why I recommend a particular solution. You will be happy like the others.