1. Unopened barrels of water can be kept for about three months. The shelf life of opened bottled water is only about 15 days. It is best to drink it within a week to ensure water quality.

2. Water is the source of life and an essential drinking product in life. Barrels of water are used in homes and companies. Freshly purchased barrel water is sealed, which prevents bacteria from entering the barrel and affecting the water quality. When the barrel is opened, it will come into contact with the air, and it is easy to harbor bacteria during use.

3. Due to structural defects, once the barrel is opened, microorganisms and dust in the air will enter the barrel from the entrance, thus causing contamination of drinking water. If the barrel is left open for a longer period of time, the flavor will not change, but the water inside will contain a lot of bacteria.