When i was working i used to buy and use a lot of water treatment chemicals, for use in Boilers, cooling towers etc. i used to get them in 15, 30 and 55 gal. depnding on the amt used.check with some of the business in your area, these make excellent fuel storage units(in most cases) just know that many of the chemicals are toxic and the residue in them needs to be handeled carefully and disposed of proprely. wash them out and let them drain, then set them in the sun to evaporate and moisture in them. water in fuel is not good /forums/images/graemlins/grin.gif