Hello fellow reefers, my question is if using a barrel that was used for clam juice, safe for me to store my RO/DI water and another to mix my salt? How should I go about cleaning them, I know vinegar is suppose to be one of the best options. The reason is I'm preparing to pick up my 220 G tank this Saturday and I want to buy a couple of these barrels. Just want to make sure I'm making a good decision. Thanks for the help in advance...