Fuel polishing is the technical cleaning process used to remove or filter microbial contamination from oil and hydrocarbon fuel in storage.
It is essentially the removal of water, sediment and microbial contamination from such fuels as diesel, red diesel and biodiesel. This fuel contamination, also known as 'fuel bugs' or 'diesel bugs' build up over time in stored fuels if they aren't tested and treated on a regular basis.
Fuel Analysis should be undertaken before fuel polishing is commenced so that the exact contamination problem can be rectified with a targeted solution. A second fuel test should be performed after the fuel polishing has been completed to confirm the problem has been fixed.