Diesel Bug Treatment is exactly what the product says. Marine 16 diesel bug fuel 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 litres of fuel. For serious contamination addition rates of 100ml to 100 litres may be required. Very rarely over 15 years of Marine 16 selling the product have they had to clean out a tank but for severe contamination several doses may be required to break up and remove the biological sludge that forms. Marine 16 diesel bug fuel 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 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.