Aluminum Crawfish pot oxidation layer

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Should I worry about the black/gray layer of oxidation in my crawfish pot? Or is it fine just to leave it?

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That's normal and fine. Don't scrub it.

Having that layer makes it easy to know how much water to put in the pot w/o having to fill up the basket with crawfish first.

Leave it as it is. It's most liky aluminum oxide

Best way to remove is to grindit away or have the pot anodized. Neither of these is easy or useful in any way

Harmless, does not cause Alzheimer's as you might have read. What is very dangerous is using a galvanized container, like a garbage can, lots of lead and heavy metals. I've seen idiots do it.