人吉温泉 おおがの宿
Hitoyoshi Onsen Oganoyado曹
Bicarbonate
+ Chloride · Sulfate
Sodium Bicarbonate-Chloride-Sulfate spring
Hot source · 51°CHigh silica
Composition fingerprint1.9 g/kg dissolved · Hypotonic
Na⁺96
HCO₃⁻53
Cl⁻24
SO₄²⁻22
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
Known good for
- Smooth skindry, rough skin
- Circulationtired legs
- Aches & jointsstiff shoulders
A sodium-led bicarbonate spring — the classic juso-sen style — layered with a salty chloride edge and the quiet body of sulfate, emerging hot at 51.0 °C. Weakly alkaline and soft on the skin, it sits in the Japanese beauty-water family. With 88 mg/kg of metasilicic acid, it leaves a thin silica film that makes skin feel smoother afterwards.
Analyzed Oct 5, 2015·株式会社 東洋環境分析センター