Hi guys
Only problem with getting used drums is that you may not know for sure what was in them and what impact that could have on their future use. I assume you want to use it for salt water mixing....
I have a 33 gallon plastic drum that I used for a long time, but when I upgraded to a 125 gallon tank I also upgraded to a 55 gallon plastic drum(can mix up two water changes) from McMaster Carr. It was a little expensive....$85 with shipping, but I knew for sure what I was getting.
Just my 2 cents..
Dave