Power Service 09016-09 Bio Kleen Diesel Fuel Biocide - 16 oz. Dual-phase effective in both diesel fuel and water as recommended by major diesel engine manufacturers Kills microbes (bacteria and fungi) that grow in dispersed and free water associated with diesel fuels Improves fuel performance and reduces engine maintenance costs Prevents fuel-filter plugging and fuel system failures Effective in all diesel fuels, including ultra low sulfur diesel, biodiesel and biodiesel blends