Fuel storage additives - where to get
 

I store about 300 gallons of diesel in a semi-transparent plastic container. I cleaned it out not long ago using a pressure washer and removed a decent amount of what I believe is some sort of mico-organisms. I read on the power service website about bio kleen, but have not been able to find a biocide type product at any stores in my area.

What product do you recommend and where can I purchase it?