An amount of water equal to 100 ml per 1000 liters is sufficient for the development of such bacteria. Bacterial sludge (biomass) blocks filters with brownish-black sludge and muciloginous appearance, their multiplication triggers corrosion processes in the reservoir. Eco-Bact is a highly effective biocide based on methylene-bisoxazolidine. It is soluble in diesel fuel and concentrates in the aqueous phase where the contamination is. Eco-Bact decontaminates the already contaminated fuel and can be used as a periodic prevention and maintenance treatment.