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
An alkaline simple thermal spring, analysed on water piped in from Gero Onsen's central delivery pump station rather than from a well on the property. The alkalinity gives the slippery, soap-like feel that places it squarely in Japan's beauty-water family, while the water itself is lightly mineralised (374 mg/kg of dissolved solids), so it stays gentle over a long soak. Metasilicic acid at 59.7 mg/kg leaves the thin silica film that makes skin feel noticeably smoother afterwards.
Sampled at delivery pipe·Analyzed Dec 3, 2018·一般財団法人 岐阜県公衆衛生検査センター
