What are the seven international standards for healthy water?

The ideal healthy water should have seven characteristics: (1) pollution-free, and it does not contain any substances that are toxic, harmful and smelly to human body. (2) The hardness of water is moderate, generally around 100mg/L (calculated by calcium carbonate); (3) contains a proper amount of minerals needed for human health. (4) The 4)PH value is weakly alkaline. (5) The dissolved oxygen in water is moderate, about 6 mg/L. Only water with dissolved oxygen is living water. (6) Small water masses with less than 6 water molecules are called small molecular water. (7) The physiological functions of water as a medium, such as water solubility, permeability, emulsification and metabolism, are stronger.