Total hardness - Total hardness is the amount of calcium and magnesium ions in the water. The maximum permissible limits of the total water hardness for drinking water are not specified by the local authorities. Water with a total hardness of up to 2.4 mg-eq / l is considered to be soft water, but higher than 2.4 mg-eq / l is considered hard water. Hard water creates deposits on various household appliances, heating element surfaces, pipelines thus damaging the equipment and increasing pressure losses in the pipelines. Also hard water can increase the use of cleaning and washing supplies and reduces energy effeciency.
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