A barrel of bottled water is 18.9 liters. The bottled water in the domestic market is 5 gallons, which is the common 18.9 liters of bottled water. Barreled water refers to pure water or mineral water treated by modern industrial technology (reverse osmosis, electrodialysis, distillation, resin softening, etc.). ) and filled into PVC barrels through the filling production line. The water source of water filling enterprises is pollution-free natural spring water or mineral water, which contains more minerals, trace elements and nutrients beneficial to human body than water from water purifiers. Long-term drinking is beneficial to human body.