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What is the white discoloration on my chimney?

April 26, 2017chimney discoloration white

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What is the white discoloration on my chimney?

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The whitish discoloration, known as efflorescence, is a crystalline deposit of white powder-like water soluble salts. This condition should be corrected. Some of the causes of efflorescence include an unlined, oversized or deteriorated flue, rain, humidity and condensation.