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As long as there is a patina (dull grayish, even color) on the aluminum, it's safe to use in any hot part of the process.
The real care comes when you clean it. Don't use oxidizeing cleaners (i.e.: oxiclean, one-step) or caustics for cleaning the pot. Heavy, hard scrubbing is problematic, too; as you scrub the oxide layer off, it turns your water black (intuitively, you just want to scrub harder).
You can restore the oxide layer by putting the pot in the oven for 15 min at 400F. Boiling water for an hour in it works, too.