UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary

Glossary of Karst and Cave Terms

hardness
1. Property of water that prevents lathering because of the presence of cations, mainly calcium and magnesium, which form insoluble soaps [10]. 2. The sum of calcium and magnesium ions expressed as the equivalent amount of calcium carbonate (CaCO3) [16]. 3. The property to form insoluble salts of fatty acid (soap) [16].