Surface active agents. Preparation of water with known calcium and magnesium hardness Ingestion-build-51747 BS 903-C4 provides methods and

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Surface active agents. Preparation of water with known calcium and magnesium hardness Ingestion-build-51747 BS 903-C4 provides methods and1 Scope This European Standard specifies a method of preparing water of known calcium and magnesium hardness for use in testing surface active agents and products containing them.