下呂温泉
Gero Onsen湯
Simple
Sodium spring
High silica
Composition fingerprint0.4 g/kg dissolved · Hypotonic
Na⁺97
F⁻18
HCO₃⁻17
CO₃²⁻17
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Fluoride F⁻
- trace; drinking limits apply.
Known good for
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A lightly mineralized simple thermal water in the Gero Onsen tradition, carrying just 353.9 mg/kg of dissolved solids — gentle on the body. The cations are almost entirely sodium (96.55 mval%), and with bicarbonate and carbonate ions in the mix the water is soft on the skin, of the classic Japanese beauty-water family. A generous 66.7 mg/kg of metasilicic acid leaves the kind of silica film that makes skin feel noticeably smoother afterwards.
