Introduction to Wuli Spring: It is 5 miles away from the mineral springs of Aershan Sanatorium. It is known as "the largest strange spring in the world". The water is rich in metasilicic acid, strontium, lithium and other 13 kinds of trace elements necessary for the human body. and all macroelements, it has a softening effect on aortic sclerosis, and has a good therapeutic effect on heart disease, hypertension, rheumatism, rheumatoid, neurological disorders and other diseases.