Black specks in water?

Not sure if this is the right place to ask this, so I apologize if I'm a lost redditor rn. I work at a soda shop, and lately I've noticed black specks coming out of the water/lemonade nozzle on our soda machine. Occasionally I get them from our 7up Zero nozzle, as well. But no other soda dispenses them. We soak our nozzles in hot water every night, and we wash them by hand once a week. So I don't think dirty nozzles are the problem. Does anyone know what the black specks could be? I haven't found any concrete answers online yet. I even called our supplier, and they just said to make sure the nozzles are clean. Also, don't know if this is relevant, but I live in the middle of nowhere, and we get our water supply from a local underground well. It's not city water.

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