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Condensation water in diesel fuel tanks can lead to the development of micro-organisms, leading to bio-sludge and bio-corrosion, which can quickly clog filters and nozzles.grotamar 82® is a biocide with a protective formula for keeping the tank clean!grotamar 82® is suitable as a preservative for up-to-date B5* - B100* diesel fuels and heating oil. It has fast bactericide and fungicide efficiancy and enhanced anti-corrosion and anti-oxidation properties. Grotamar 82® provides long-term protection against microbial material degredation.Recommended dosing: A shock dose requires one bottle of grotamar 82® (1 l) to 1000 l of fuel. Preventive dose is 250 ml to 1000 l of fuel (each new tank filling).