So I am able to get some cheap 55 gallon plastic drums... But they had bio degradable soap previously in them. Could these be safe for a salt mix station if clean out? IF so what to clean with?
FWIW - my 55g barrel was used at the hospital I work at to contain either photographic developer or fixer - it's been nearly 30 years now and I don't remember which. I washed it well and put it in service. It doesn't seem to have killed anything yet so I'm thinking you'll be fine.
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