Looking for a bulk Fuel Additive/ Treatment to treat about 4k-5k litres at a time. Tried Farfan but the lady didnt seem knowledgeable. So checking around. Costing too much to use smaller treatments. Will do something at the tank level.
You can also try Specialist chemicals. I used to buy some excellent diesel fuel treatment from them by the gallon. Pri-D was the name I think and a micro biocide for treating algae. Was lil expensive about $700 for the gallon of treatment but it used to work for me.