1, drink hard water is good or soft water is good? To understand drink hard water is good or and soft water is good, first understand the relationship between calcium and magnesium ions and human health. Calcium and magnesium ions are essential nutrients for the human body every day, if the water has a certain hardness, through drinking water can supplement a certain amount of calcium and magnesium ions. If it is a person who takes soft water for a long time, it needs to be supplemented by other ways. However, too high and too low water hardness is not good, because water hardness and some diseases have a close relationship. In areas with high water hardness, the incidence of cardiovascular disease in the population is lower, but the incidence of kidney stones increases with the water hardness. The south of China is mostly soft water, and the northern region is mostly hard water. China’s drinking water standards are not more than 25 degrees, the most suitable drinking water hardness of 8-18 degrees, belonging to the mild or moderate hard water. Hard and soft water and taste also has a relationship, hard water is refreshing, most of the mineral water hardness is higher, so that people feel refreshing and delicious, soft water is obviously tasteless. But with hard water for tea, coffee, the taste will be affected. Some food processing water is more delicate, hard water will affect food processing, easy to cause protein precipitation, inorganic salt precipitation or more difficult to cook, and beverage water with soft water is better. Boiler water should generally make the hard water softening, otherwise there will be too much scale and accidents. 2, drink pure water or tap water? At present for is drink pure water or and tap water good, expert opinion is not consistent. Some experts believe that drinking water is to replenish water, there is no need to consider nutritional issues. Other experts believe that tap water has many trace elements and inorganic salts, which are beneficial to the human body. Then tap water in the end what is the nutrition?1000 ml of water, zinc, iron content of less than 0.2 mg, adults need to supplement the daily zinc 10 mg to 15 mg, iron 12 mg to 18 mg. Daily intake of trace elements from the water is less than 1 mg, compared with the human body needs trace elements is insignificant. However, the water contains calcium and magnesium elements are high, the human body still has certain benefits. The real pure water due to multi-layer filtration, generally removed from the water impurities, trace elements, inorganic salts and disease-causing bacteria, safe, non-toxic, non-polluting, beneficial to the human body, and the lack of elements can be ingested from food. Therefore, if the economic conditions allow, the purchase of truly pure water, which is the progress of mankind. However, due to the current production of pure water is very unstandardized, fish eyes mixed, if you buy a substandard product, but harmful to the body. So what’s wrong with drinking tap water? Tap water is produced by the water plant under strict quality control, drinking tap water can be completely at ease. But some high-rise buildings of the water tank whether there is pollution is worthy of people’s vigilance. As for the tap water scale because the water contains calcium, magnesium ions caused by the body has no adverse effects, tap water is affordable, the ordinary working class is not necessarily to catch up with the market trend.