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I wonder if it's not iron from the water. Is it a brownish/reddish color? Are you on a well? It's also possible that the porcelyn has been scratched and worn away in the bowl by using an abrasive brush. If it is then the bowl will be hard to keep clean cause it's now more pourous. No way to fix that besides replacement. They sell toilet brushes at the grocery store that are a teflon pad and won't scratch the finish.
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