- If the water in the circulation piping sits stagnant for a while, there’s a good chance that this black gunk will start growing; it can take as little as a month for this to happen. Personally, I don’t care what the stuff is – it’s gross no matter what. Have you ever turned on a whirlpool and seen a bunch of nasty black gunk shoot out of the jets? I’ve heard it’s either mold or some kind of bacteria that feeds off dead skin cells.
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- Septic Inspectors Sayreville, NJ