Even though safe and healthy drinking water has different "tastes" in different regions. What leads to it?
1. The hardness of water
First, we need to know what are hard water and soft water. Hard water means water with high potassium, zinc, strontium, etc. The opposite is soft water. Converting calcium and magnesium into calcium carbonate concentration is the hardness of the water. If the hardness is too high, the taste is not good and some drinkers will also have uncomfortable gastrointestinal reactions. The water taste won't be sweet if the hardness is too low. In China, we ask the total hardness of drinking water be less than 450mg/L.
2. Total soluble solids
It means the total amount of dissolvable solids in water, such as calcium, magnesium, sodium, potassium, chloride ion, carbonates, silicates, sulfates, and some organics. For example, when the water with much MgCl2 and CaCl2, the water taste will be bitter.
Carbonic acid is carbon dioxide dissolved in water. Carbonate gives the water a refreshing and good taste. But if the content of carbonate is too high, the water taste will be irritating and taste like soda.
4. Chloride ion
If the content of chloride ions is too high, the water will taste of salt. Groundwater in coastal areas is often unsuitable for drinking due to seawater erosion or excessive exploitation of groundwater, resulting in seawater intrusion, and the chloride ion content becoming too high.
Sulfate is common in natural water. When the content in water is high, the water will have an astringent taste.
If the content of silicates in water is high, it tastes not good.
Iron is a metal that exists widely in nature, and it is also commonly found in water. Iron in water has no toxic effects on human health, but only affects taste and sense. If the water has much iron, it will have a metallic taste.
Manganese exists in various salts as compounds in nature and often coexists with iron compounds. Manganese is an essential microelement for plants and animals. But when the manganese content in the water exceeds 150 μg/L, the water will have an unpleasant taste.
9. Residual chlorine
Residual chlorine is the chlorine remaining in the water when using chlorine-containing disinfectants, which take chlorine odor. The chlorine odor is often referred to as the smell of bleach.
In the process of tap water treatment, in order to prevent the growth of microorganisms in the water supply system, it is necessary to maintain a certain residual chlorine content in the water supply system. Therefore, municipal tap water often has this smell, and this bleach smell is difficult to reduce to a level that people cannot perceive. In areas with high temperatures, the microorganisms grow rapidly since the high temperature, so the amount of chlorine should be increased, and the chlorine odor of tap water will be more obvious.
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