Startron works slower than Biobar but it not only kills the alge/fungus but it breaks it down small enough to go thru the fuel filters to be burned with much less plugging of the filter.

I have treated a couple of vehicles and only needed 1 filter change on one of them and no filter change on the other.

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Ron Schroeder
'85 300 Turbo Diesel 2 tank WVO
'83 300 Turbo Diesel 2 tank WVO
Some former WVO vehicles since ~1980:
'83 Mercedes 240D
'80 Audi 4000D
'83 ISUZU Pup
'70 SAAB 99 with Kubota diesel
'76 Honda Civic with Kubota diesel
'86 Golf
Several diesel generators
All with 2 tank WVO conversion
LI NY