Originally Posted by RetrogradE
My neighbor owns / runs Rotopax . . .
There have been debates here and elsewhere as to what the real differences are between the "water" and "fuel" containers. Some people assert that the "water" containers won't resist fuel, others say they're fine; some say that the plastic used in the "fuel" containers is not certified for contact with drinking water (maybe it leaches out chemicals that are bad for us or something, who knows). Others assert that the only difference is color.
It sounds like you're in a position to get the truth straight from the horse's mouth. Can you please ask him?