I've been using empty IO salt buckets as secondary fermentation vessels for beer making. Can't absolutely guarantee they're rated food safe, but no issues to date & I have more than I need. As far as water changes I have no concerns whatsoever in using the empty IO buckets. After all, they held the salt used in to mix water in my tank. If not mistaken any plastic with the #2 reycling designation is considered food safe.
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