The shelf life before unopened is 2 months, but Nongfu Spring has always suggested drinking it within 2 weeks after unsealing in winter, and professional bottled water brands will also inform you in summer 1 week. Because the air enters after the bottled water is opened, there are impurities in the air, which will affect the quality of water for a long time.
After opening, it is mineral water, pure inorganic matter, which is not easy to deteriorate (that is, produce bacteria), but minerals may react with the gas in the air for a long time (very weak and slow), so the storage time should not exceed one day.
Healthy water standard
1, containing no toxic, harmful or odorous substances;
2. The hardness of water is moderate;
3. The minerals needed by the human body are moderate;
4. The 4.PH value is neutral or slightly alkaline;
5. Dissolved oxygen and carbon dioxide in water are moderate;
6. The water mass is small and easy to be absorbed and utilized by human cells;
7. Water has strong nutritional and physiological functions, such as permeability, solubility and metabolism.
The above contents refer to Baidu Encyclopedia-Mineral Water.
The above contents refer to People's Daily Online-Pure Water, Mineral Water ≠ Healthy Water? Four kinds of water cannot be drunk in the morning.