I first used the mold bombs in my temporary housing. After results was an improved air quality. I used 6 in my 2 br condo that had been flooded from above, sustained years of inner wall leakage, and flooded basement area below. I am able to work with a mold mask for several hours. The biocide liquid was used on floors, counter tops, with ventilation, the interior wall cavity in the hallway I am in the process of spraying. We are able to remove the items that hold mold spores and just want to say a really big thank you for this product.