TCM Wiki Tianshui San 2016-09-24 Tianshui San Name Tian Shui San Actions Clear heat and relieve thrist. 天水散 The Prescription of Tianshui San The Effect of Tianshui San Indications Polydipsia. Dosage and administration Decoct 9 g. It should be wrapped during decocting. Notes for Tianshui San Origin It is a mixture of Hua Shi, Gan Cao, Han Shui Shi.