下呂温泉
Gero OnsenSodium Chloride spring
- 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.
- Smooth skindry, rough skin
- Recoveryfatigue, stress
An alkaline simple thermal spring, sampled at Gero Onsen's central delivery pump station rather than at a wellhead. It is alkaline enough to feel distinctly slippery and soft on the skin, which places it squarely in Japan's beauty-water family, while the water itself stays light — 374 mg/kg of dissolved solids, with nothing sharp or overwhelming in it. A solid 59.7 mg/kg of metasilicic acid leaves the kind of thin silica film that makes skin feel smoother afterwards. The certificate lists autonomic nervous system instability, insomnia and depressed mood among its spring-type indications, which is a fair description of what it is for: a long, unhurried soak rather than a bracing one.
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