Introduction to Tiesei Ganjing: In the Song Dynasty, the county was affected by the tide of the Yongning River, and the area was repelled by brine, making the water taste salty. Monk Jingzhen of the Northern Song Dynasty dug a well at the junction of Jiufeng Creek and placed an iron window underneath to limit sand and gravel. In the fifth year of Qingyuan (1199), the county magistrate Chang Junsun built the "Inexhaustible Pavilion" on the well. The water in the well is clear and sweet, and it never dries up during severe droughts. There is a saying that a black dragon lurks under the well. It has been loved by the people in the county for generations, and there is an endless stream of people carrying water. In the 1970s, the "Ganquan Pavilion" was built, dug 7 meters deep and renovated. In the southwest, there is the "Shesieve Ancient Well". There are small wells among the large wells. They are exquisitely constructed. The water quality is like the iron sieve sweet well. The water source is rich and used by the water plant.