Mikiya Ryokan

A sodium-calcium chloride-sulfate spring drawn from the Furo-no-Yu source at Shima Onsen. The pH is neutral and mineralization is moderate at roughly 1.4 g/kg, pairing the heat-retaining feel of chloride water with the quiet body that sulfate adds. Metasilicic acid runs to 104 mg/kg — enough to leave the thin silica film that puts this water in Japan's beauty-water family. The posted usage disclosure lists no heating, no recirculation and no disinfection; water is added only from June to August, when the source runs too hot to serve undiluted.

Analyzed Mar 26, 2001·（社）群馬県薬剤師会環境衛生試験センター