Join Date: Sep 2008
Location: Victoria B.C. Canada
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I don't think there is any difference except if they have been used and that will certainly taint the water. But I'm not an expert. I would rinse it out well first, fill with water and a bit of bleach, let sit a few hours and then flush well, just like you would with a water tank annually.
And mark them as water containers so nobody puts anything else in them.
Living aboard in Victoria Harbour