I know an aunt who is a manager of Yangshan Bailong Mineral Water Company. She used to be a manager of Suzhou Kaolin Company, and later she was sent to the mineral water company. According to her, it is the underground spring water that gushed out while mining kaolin. Because it used to be discharged as waste water, it was too wasteful. Later, after testing, it reached the level of drinking water, so it was purified and sold in cans. My family always drank Yangshan Bailong. Because it was weakly alkaline water.