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I am noticing a white-looking substance growing on my chimney where it got wet. What is that exactly?

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I am noticing a white-looking substance growing on my chimney where it got wet. What is that exactly?

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This white powdery substance is called efflorescence. It is harmless and is formed from a mineral which is basically a water soluble salt. It will wash away with special detergents and will stop appearing once the source of water is removed.

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