Power Service Bio Kleen is a fuel biocide that kills bacteria and fungus microbes in diesel fuel and water. This quick kill product is effective for long term diesel fuel maintenance. The reduced sulfur content that is now used for cleaner burning fuels has created ideal environments for microbes to grow in fuel tanks and the only way to kill these is with a biocide. This product will also prevent fuel filter plugging and system failure. One bottle will shock treat 320 gallons or maintenance treat 880 gallons.