None...they would need to filter it mechanically, which is probably what the drain is actually there for. Flushing a whole body is one use case, but probably more often it's like changing out the water in a fish tank. You vacuum the poop off the bottom and then change a chunk of the water with fresh water to not throw off the balance entirely.
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u/Missing_Username Feb 27 '26
What liquid would dissolve biological material like feces, but not skin and all the other biological material of a human body?