today, my plans are to drain and pull the tank, then wash out the inside and treat it with algicide, which i would empty out of the tank before filling with fuel again. this work will be accompanied by a fuel line, return line and filter replacement. however, the only algicide i was able to find is made for swimming pool treatment (bioguard inhibit). is this alright to use in the tank or should i order one of the brands specially made for diesel?

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1980 240D, 197580 miles - "The Stuttgart Stomper"