Calcium Sulphate

These salts are derived from calcium sulphate and can form on the surfaces of walls and other building materials as a result of moisture dissolving them, transporting salts to the surface, where they crystallise through evaporation. In damp environments, the crystallisation of these salts can cause surface damage and efflorescence, which manifests as a white, powdery substance. Surface salts can be indicative of a damp problem. These salts are harmless, originate from the building materials themselves, and typically result from the constant fluctuations between evaporation and condensation.

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