Hardness.
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Last Update: 2020-12-01
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Source: Internet
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Author: User
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is a quality index of water, which quantitatively represents the content of calcium salt and magnesium salt in water. The hardness of water is divided into permanent hardness, temporary hardness, and total hardness. When analyzing the hardness of water in production, the total hardness is usually calculated, not the temporary hardness and the permanent hardness, respectively. The hardness of water is expressed in different countries. It is
1 degree (expressed as 1 degree) that contains 10 mg CaO (or equivalent to 10 mg CaO) in 1L water. Water with a hardness of less than 8 degrees is called soft water, water with a hardness greater than 8 degrees, and water with a hardness greater than 30 degrees is called the hardest water. China stipulates that the total hardness of tap water shall not exceed 25 degrees. The hardness of water is also commonly expressed by calcium carbonate content mg/L (or ppm).
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