Yes According to the international standard TDS, the pure water test value of Nongfu Spring is 66 mg/L, and the PH value is 7. 1, which is the laboratory level and the safest. Nongfu Spring, namely Nongfu Spring Co., Ltd., formerly known as "Zhejiang Qiandao Lake Yangshengtang Drinking Water Co., Ltd.", headquartered in Hangzhou, Zhejiang Province, is the holding company of Yangshengtang. Established on September 26th, 1996.