Due to the severe nature and potential health risks of mold I cannot guarantee complete neutralization of all mold spores in your property. Please consult with a professional mold remediator in your local area prior to and during your ozone treatment to ensure optimal results. While ozone is considered part of the solution by many experts it does not take the place of other remediation efforts including cleaning, removal, and extermination of the mold source itself. Although many commercial contractors use our machines as a primary tool in their mold remediation protocols I myself am not a certified mold expert so please take my advice as an honest opinion only. This should be understandable to most people however if you have any questions about using ozone to fight mold please contact me prior to ordering.