Long-term water shortage, bad drinking water is one of the reasons causing the students physical deterioration. Drinking water for students should be unpolluted and meet the human physical needs.
Thus, student’s drinking water should meet the following standards:
(1)Does not contain toxic, harmful and smelly substances.
(2)Water hardness is moderate(the content of CaCO? is 50~200 mg/L).
(3)The content of mineral needed by human is moderate.
(4)Slightly alkaline (pH＝7_8).
(5)Water molecule is small.
(6)Strong physiological function.