下呂温泉
Gero Onsen湯
Simple
Sodium Chloride spring
Composition fingerprint0.4 g/kg dissolved · Hypotonic
Na⁺95
Cl⁻56
CO₃²⁻17
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Chloride Cl⁻
- table-salt anion — coats the skin and holds heat in.
Known good for
- Recoveryfatigue, stress
Gero Onsen — a sodium-led simple thermal water as documented on this wall panel. Mineralization is light (total dissolved solids 374.4 mg/kg, gas excluded), so the water reads gently on the body rather than heavily. The panel reproduced here covers only the ion table; spring temperature, pH and the formal classification are not visible in this crop, so the bath-side feel is best confirmed at the property itself.