How hard is the water quality in Jining, Shandong Province?

Verified by the water supply enterprise, the water supply source in Jining City adopts deep groundwater. The groundwater quality is excellent and there is no pollution. However, there is a problem that the total hardness of water quality is high and it is easy to produce water and alkali. At present, there is no evidence that water and alkali have an impact on human health. Although the total hardness of source water is slightly higher, the total hardness of effluent from five water supply plants in urban areas does not exceed the national standard of 450 mg/L.