Investigation of the corrosion problem associated with microbiological contamination of jet fuel reveals a definite relationship between microorganisms and other contaminants. These contaminants include:saline water, rust, surfactants, and dirt. If we destroy the microorganisms without effectively removing the ingredients which cause both their growth in, and the corrosion of wing tanks, we are only flying on borrowed time. The problem of corrosion will never be completely solved by the elimination of bacteria alone. Only a concentrated effort to keep the total list of ingredients out of the fuel system will suffice.