穴湯
Anayu SpringOperated by · 黒川温泉自治会
Sampled at wellhead
湯
Simple
Classification
Sodium Sulfate-Chloride spring
Anayu surfaces at a hot 60.4 °C as a simple thermal spring on the weakly acidic side (pH 3.22). Total dissolved solids are light at 568 mg/kg, but the water carries a generous 253 mg/kg of free CO2 and 157.7 mg/kg of metasilicic acid, giving the otherwise plain water a faint prickle and a touch of silica smoothness. A subtle hydrogen-sulfide note drifts off the surface as the bath stays warm well after exit.
pH
3.22
Weakly acidic
Source temperature
60.4°C
Hot
Tonicity
0.57g/kg
Hypotonic
Free CO₂
253mg/kg
Typical
Free H₂S
1.40mg/kg
Typical
Radon
6.14Bq/kg
Low
- Color
- colorless and clear
- Taste
- tasteless
- Odor
- faint hydrogen sulfide
Highlights
- Top-decile hot
- High silica
Analyzed Apr 8, 2021·株式会社MCエバテック分析事業部 熊本分析センター·Cert no. X30-0867