Use Biocides Judiciously—Don’t Rely on Them Routinely

Eliminate water first (the primary enabler of microbial growth—”diesel bug”). Use water separators, polishing systems, or tank drainage.

Reserve biocides for active infections: Apply at maximum recommended strength to eradicate the problem, then discontinue routine use.

Biocides are often halogenated and corrosive—overuse risks damaging components like seals, pumps, and injectors. https://dieselcraft.com/portable-fuel-polishing/