Diesel Bug Treatment is exactly what the product says. Marine 16 diesel bug treatment is a biocide blend formulated especially for preventing or eradicating the fuel spoilage organisms known collectively as diesel bug. ***A 100ml bottle is sufficient to prevent diesel bug growth in 2000 ltrs of fuel. For serious contamination addition rates of 100ml to 100 ltrs may be required. *** Marine 16 diesel bug treatment disperses into both the water and fuel phases in your tank and will remain sufficiently active for over a year at both high and low temperatures. Marine 16's Diesel Bug Treatment is the **fuel treatment of choice** for the RNLI, The Royal Marines, Sea Start and River Canal Rescue as well as being number 1 in the Practical Boat Owner magazine review