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What is the whitish deposit I sometime see on pavers and walls?

April 26, 2017deposit pavers walls whitish

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What is the whitish deposit I sometime see on pavers and walls?

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This is efflorescence, a natural formation that may appear on any concrete or masonry product. It is actually the residue of soluble salts carried to the surface by moisture – a natural by-product of the chemical reaction between cement and water. Efflorescence does not affect structural integrity and will dissipate over time. It is not indicative of a flawed product. If desired, it can be removed using specialty cleaners.