Reef nutrition

Need trashcan for WCs. Are they all treated?

I’d like to pick up a 30 gal trash can from HD or Lowes to mix water for WCs. Is there any way to completely verify that the interior has not been treated with antibacterials, fungicides, or odor eliminators?

-Gregory
 
I have my brute from my old tank on my truck with a float switch. Need to get rid of it. $20 or frag.
It's only touched salt water.
 
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