下呂温泉（送湯ポンプ所）
Gero Onsen (Delivery Pump Station)湯
Simple
Sodium Chloride spring
Hot source · 56°CHigh silicaTop-decile alkaline
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
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A simple alkaline thermal spring drawn from the Gero Onsen delivery pump station. Dissolved solids come to only 374 mg/kg, so the water is lightly mineralized and gentle on the body, while the alkalinity gives it the slippery, soap-like feel that places it in Japan's beauty-water family. Metasilicic acid at 59.7 mg/kg adds to that smoothing effect. The spring-type indications posted on the panel are narrow and telling — autonomic nervous system instability, insomnia and depressed mood — so this is water documented for settling the nerves rather than for mineral punch.
Analyzed Dec 3, 2018·一般財団法人 岐阜県公衆衛生検査センター
