蔵王温泉南地区給湯
Zao Onsen South District SupplyOperated by · 蔵王温泉南地区給湯組合
Mixed source
- Color
- colorless and clear
- Taste
- strongly astringent
- Odor
- strong hydrogen sulfide
Aluminum-Hydrogen Sulfate-Chloride spring
- Aluminum Al³⁺
- shows up in acidic volcanic water.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Aches & jointsstiff shoulders
- Sensitive-skin cautionbroken or dry skin
The bath is fed by the Zao Onsen south-district supply cooperative, which pools six separate wells into a single blended line. What arrives is a sharply acidic, sulfur-bearing aluminium sulfate-chloride water — acidic enough to prickle on contact, with a pronounced astringent bite if tasted and an unmistakable rotten-egg note of H₂S coming off the surface. It still runs colorless and clear, and carries a generous 226.5 mg/kg of metasilicic acid, the kind of silica load that leaves a thin film and noticeably smoother skin. The house notice states that no water is added to the source; only in winter, for temperature control, may it be recirculated and reheated.
Sampled at delivery pipe·Analyzed Jun 2, 2016·日本環境科学株式会社·Cert no. 日環科 第327号