Cooking fish and vegetables with hard water will destroy or reduce the nutritional value of food, because it is not easy to cook; Making tea with hard water will change the color and flavor of tea and reduce its drinking value; Using hard water to make tofu will not only reduce the yield, but also affect the nutritional composition of tofu.
If you use hard water to wash clothes, you need to add a lot of softener to the water; If washed with hard water, sanitary ware is easy to scale; If you take a bath with hard water, your skin will be dry and tight, and your hair will be yellow and dull. If hard water is used in electric water heaters and humidifiers, it is easy to scale in electrical appliances, thus increasing energy consumption and shortening service life.
Extended data
Origin:
When water condenses in the atmosphere, it will react with carbon dioxide in the air to form a weak acid called carbonic acid. The acid finally falls to the ground with the rain, and then flows through the upper part of the soil to reach the rock layer. Carbonic acid dissolves lime (calcium carbonate and magnesium carbonate), neutralizes lime and hardens at the same time.
In some areas, karst caves and nearby hard water are formed in this way. Hard water can be divided into temporary and permanent. Temporary hard water is usually related to carbonate and bicarbonate of calcium and magnesium. This crystal can exist in water for a long time, until the air pressure or temperature changes, which makes the water supersaturated, causing the precipitate to adhere to the hot surface or rough surface.
Such as pipes and heat exchangers, that is, hard scales are formed; Permanent hard water is mainly related to calcium sulfate and magnesium sulfate, and will not be affected by the change of heat and air pressure, but if the water is evaporated, it will still remain and form hard scale.
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