横湯第一ボーリング、横湯第二ボーリング、熱の湯の混合泉
Yokoyu No.1 Boring, Yokoyu No.2 Boring & Netsu-no-yu BlendMixed source
塩
Chloride
+ Sulfate
- Color
- colorless and clear
- Taste
- slightly salty with a faint sulfur note
- Odor
- not recorded
Sodium-Calcium Chloride-Sulfate spring
pH 8.0Weakly alkalineHot source · 87°C
Composition fingerprint1.6 g/kg dissolved · Hypotonic
Na⁺69
Ca²⁺26
Cl⁻60
SO₄²⁻36
◀ 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
- Warmingcold sensitivity
- Circulationtired legs
- Aches & jointsstiff shoulders
A sodium-calcium chloride-sulfate spring, weakly alkaline and soft on the skin. The wellhead runs at 86.5 °C, putting it among Japan's hottest natural sources (cooled before bathing). The water is almost colorless and clear, slightly salty with a faint sulfur note, and moderately mineralized at 1,611 mg/kg of dissolved solids for noticeable body.
Sampled at bath inlet·Analyzed May 26, 2016·一般社団法人 上田薬剤師会 検査センター·Cert no. 中28-2(No.427)