Use a biocide that also has an Enzyme. The Enzyme eats up the dead bodies so the will tend not to plug up your Fulters.
There should be more than a few threads on the above.
Buying stuff to kill off what is in the Tank may be expensive right now but a plugged filter can stop your Car in the very worst place. And, changing Filters can also be expensive.
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84 300D, 82 Volvo 244Gl Diesel
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