Cecil:
Taken with a chuckle! On the serious side, many, if not most, chemical drums are disposed of because they can't be cleaned or the cost of disposing of the waste is too high. If it were me, I would only use drums with a known history. Out west here we get drums that were used once to transport Olives from Europe. I have several that I have been using for years and still can smell the Olives. If you were to wind up with a drum that had contained something like Bromine, and only a few ounces in a pond could be quite bad. The human nose can detect Bromine down to incredible low doses - smells like shoe polish and aside from the possible toxic effect, LMB should not taste like your loafers!
