Sawada park open-air bath

A blended source: the Nishina-Dogashima No. 5 and No. 16 wells are combined, and the sample is taken at the town's hot-water distribution point rather than at a wellhead. The chemistry is a calcium- and sodium-led sulfate spring — settled, mineral-rich water of moderate mineralization, about 2,290 mg/kg of dissolved matter with sulfate dominating the anions. At pH 8.8 it is alkaline enough for the soft, faintly slippery feel that places it in Japan's beauty-water family. The certificate classifies the source itself as a high-temperature spring; at the point of use the water reaches the bath at 40.5 °C.

Sampled at mixing tank·Analyzed May 28, 2012·一般財団法人静岡県生活科学検査センター