Product information

Water hardness is caused by the presence of calcium and magnesium salts. High levels of hardness prevent the formation of lather with soap, and can cause scaling in water systems, particularly steam boilers, engine cooling systems and fresh water pipework. Hardness is an important control test in a wide variety of applications.


1. This test measures total hardness, i.e. the total content of calcium and magnesium ions in the water.

2. The expression of hardness results is normally expressed as mg/l CaCO3 (calcium carbonate). This is a convention to allow the comparison of different results and does not necessarily indicate that the hardness is present in the water in only the calcium form.