Ambient air, which gets into reservoirs, causes water condensation that carries dirt. This dirt, <br>in contact with both water and diesel oil, creates bacterial proliferation, which will result in a biomass deposit. This waste material can cause breakdowns by blocking up fi lters and injectors. Therefore, diesel oil on board requires that 2 types of product be used: An additive that can eliminate water from tanks and aid combustion, as well as a biocide able to destroy bacteria. In addition, a dispersant that can eliminate diesel oil spread accidentally on the sea surface is recommended. Another type of incident that can occur is the accidental fi lling of tanks with the wrong products, notably water and diesel. An alkaline detergent will enable the elimination of diesel in water.