In the process of treatment, purified water not only removes pollutants in water, but also removes trace elements necessary for human body. Hygiene is guaranteed, but pure water has a strong ability to dissolve minerals and trace elements. Not only will it not supplement the trace elements in the human body, but it will also dissolve the original trace elements, nutrients and nutrients in pure water and then excrete them, resulting in the imbalance of nutrients in the human body and loss of health.