比良の湯
Hira-no-yu Spring硫
Sulfate
+ Chloride
- Color
- colorless and clear
- Taste
- faintly metallic, with an iron edge
- Odor
- not recorded
Sodium-Calcium Sulfate-Chloride spring
pH 4.3Weakly acidicHigh silica
Composition fingerprint1.1 g/kg dissolved · Hypotonic
Na⁺51
Ca²⁺37
SO₄²⁻52
Cl⁻47
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
Known good for
- Aches & jointsstiff shoulders
- Circulationtired legs
- Warmingcold sensitivity
A sodium- and calcium-led sulfate spring with chloride as the second anion — sulfate gives the water its quiet body while the chloride adds a faint salty edge that holds warmth on the skin. It runs weakly acidic, colorless and clear at the wellhead, with a faint metallic iron note on the tongue; the lab tasting also recorded a touch of bitterness. Dissolved solids sit at a moderate 1,145 mg/kg, and the standout figure is metasilicic acid at 140.1 mg/kg — enough silica to leave the thin film that makes skin feel noticeably smoother afterwards.
Sampled at wellhead·Analyzed Oct 30, 1998·長野県衛生公害研究所