Quote:
Originally Posted by PR-Giants
This is the anaerobic condition you are referring to and it is confirmed by the nasty smell present.
Black Slime nov 21

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I think Olaf has hit the nail on the head: standing water does not necessarily lead to anaerobic conditions. The photo above does not show the classic dark black color that would be present (from hydrogen sulfide buildup) if the conditions were actually anaerobic.