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Efflorescence

White, powdery substance

Efflorescence is a white, powdery looking substance which can appear on or cement blocks. According to Wikipedia, it is is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process involves the dissolving of an internally held salt in water, or occasionally in another solvent. It is not mold.

Efflorescence on cement block
Efflorescence on cement block

How to remove efflorescence:

  • Washing with a mild detergent and a scrubbing brush.
  • Power washing.
  • Sand blasting, but this must be done by a professional.
  • Chemically treated, please check this out with an expert.
Efflorescence on a cement floor
Efflorescence on a cement floor
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