Otto Graf GmbH
Plastic Products
Tel. +49 7641 589-0
Fax +49 7641 589-50
Carl-Zeiss-Straße 2-6
DE-79331 Teningen, Germany

Water hardness

Terms for W

Wastewater fee
Water cycle
Water hardness
Terms 1 to 4 from 4

Water hardness

Water hardness indicates the calcium and magnesium content in the water. This can form insoluble lime compounds. Water hardness is measured with the measuring unit “degree of German hardness” (dH). Rainwater is particularly soft water, which is especially suitable for laundry, because due to its excellent properties, it prevents scaling and wear on washing machines and only low detergent consumption is required. Rainwater is also advantageous for the growth of plants.

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