伊香保温泉 (混合泉)
Ikaho Onsen (mixed source)Mixed source
Sampled at mixing tank
硫
Sulfate
+ Bicarbonate · Chloride
The combined source that feeds the Ikaho Rotemburo public bath — a calcium- and sodium-led sulfate-bicarbonate-chloride water, neutral pH and hypotonic, so the feel on the skin is settled rather than sharp. It pours generously at 43.2 °C and 4627 L/min, served as free-flowing, undiluted source water. Metasilicic acid runs to 181 mg/kg, adding a gently smoothing edge, and a faint brown sediment forms on standing — a small visible tell of the mineral load.
Source temperature
43.2°C
Warm
Tonicity
1.81g/kg
Hypotonic
Flow rate
4,627L/min
Very high
Free CO₂
172mg/kg
Low
Free H₂S
3.90mg/kg
High
- Color
- colorless and transparent, with a faint brownish sediment
Analyzed May 30, 2017·群馬県衛生環境研究所衛生試験センター
