1. It should not contain harmful and toxic substances to the human body, such as heavy metals (lead, mercury, arsenic) impurities, bacterial pathogens, radioactive substances, and fluorescence, which should be controlled within the national standards.
2. The hardness of water should be moderate, usually ranging from 10-100 calcium carbonate meters, which means that each liter of water contains 10 to 100 micrograms.
3. It contains the appropriate amount of minerals needed by the human body, and its proportion should be reasonable and moderate.
4. The pH value should be neutral and weakly alkaline.
5. Water molecules should be small in order to enhance their biological efficiency and physiological functions.
6. The dissolved carbon dioxide in water should be moderate.
7. The physiological functions of water as a medium, such as solubility, permeability, diffusion, metabolism, cleansing, emulsification, etc., are strong and can effectively remove acidic metabolites from the body.
