posted 11 years ago
Here is the MSDS:
http://www.arstanchem.in/images/msds-rept-labsa.pdf
It has the usual cautions for an acid--including taking care when rinsing out if any product still present.
As far as non-food-grade barrels, that appears to be about as safe as you can get. I would have no concerns about using them as water ballast in a greenhouse (paint them black to aid in heat retention).
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