Moisture vapor migrating through the slabs can also cause “efflorescence” or powdery crystalline deposit of salts on unsealed concrete. Moisture content in concrete is all about water and ...
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What's That White, Powdery Substance on My Basement Walls?Efflorescence is the white powdery substance ... they'd need a power washer to remove these deposits from building surfaces or concrete slabs, but still, only for aesthetic purposes.
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