There has been a longtime mystery for the so called “invisible barrier” left behind resisting microbial growth on surfaces treated with Decon7. These surfaces or substrates include but not limited to the following; Carpet, clothing, brick, vinyl (fences, siding, curtains – poultry barns), cement, stucco, all wood for construction, HVAC ducting, evaporator coil pans, sheetrock, filter material, etc.