Yin-yang water refers to cold water and boiled water, or mixed water of well water and river water, which is mainly used for preparing drugs or as a drug primer, and is rarely drunk directly at ordinary times. Li Mingzhizhen's Compendium of Materia Medica Water Raw and Cooked Soup: "It is said that raw and cooked soup is cooked with a new cup. Today people call it yin and yang water. " Jiefang Daily 1944.2. 14: "Well water is too cold in summer, so when you give it to animals, you should mix it with boiling water, which is also commonly known as' Yin and Yang water', so that animals will not get sick after drinking it." At present, there is another definition of yin-yang water. One refers to the water mixed with raw water and boiled water. When the water in the fully automatic heating boiler is insufficient, it will automatically add water. At this time, if the person who picks up the boiling water is not paying attention or is in a hurry to drink, the electric water heater will flow out of yin and yang water. Yin and Yang water may contain various pathogenic microorganisms, so drinking Yin and Yang water may cause various intestinal infectious diseases. Yin and Yang water mostly comes from floating ball water heaters with single cylinder structure. However, the existing boiling water boiler adopts double-barrel structure to separate boiling water from raw water.

This is a simple regimen handed down from ancient times, that is, "add salt soup in the morning and drink honey water at night." Traditional Chinese medicine has confirmed that salt can dispel heat in the body, and has the functions of improving eyesight, calming the heart and calming the qi, and can remove the heat caused by food in the stomach. Honey is a good natural tonic, which can dispel evil spirits in the heart, nourish qi and viscera, regulate the spleen and stomach and eliminate irritability. In other words, drinking a cup of Yin and Yang water after getting up every morning (Yin and Yang water is half hot water, plus half cold water, plus a little salt) can help eliminate the waste gas overnight. Water is wealth, which can change good luck and bring good vitality early in the morning; Drinking a cup of honey water before going to bed at night can replenish qi and blood and prolong life. Nourishing in the morning and evening can achieve the effect of health and longevity. Drinking light salt yin and yang water in the morning and honey water in the evening is a health care method worth advocating, and its ultimate goal is to clear fire and eliminate the heat quality of eating all day. Drink it every day, tonify the spleen and nourish the heart, soothe the nerves and help sleep, improve immunity and make the body naturally healthy.