湯の峰温泉 平成1号・平成4号混合泉
Yu-no-mine Onsen Heisei #1 / Heisei #4 Mixed SpringOperated by · 田辺市四村川財産区
Mixed source
Sampled at mixing tank
曹
Bicarbonate
+ Chloride
Classification
Sodium Bicarbonate-Chloride spring
A sodium-led bicarbonate spring with a chloride layer — the classic 'jūsō-sen' style softened by a salty edge, delivered as a blend of two wells (Heisei #1 and Heisei #4) through a common mixing tank. The wellhead temperature of 74.5 °C puts it among Japan's hottest natural sources, and the weakly alkaline pH gives it the slippery, soft-on-skin feel of the Japanese 'beauty-water' family. A generous 153 mg/kg of metasilicic acid leaves the kind of thin silica film that makes skin feel noticeably smoother afterwards.
pH
7.90
Weakly alkaline
Source temperature
74.5°C
Hot
Tonicity
1.66g/kg
Hypotonic
Free CO₂
8.80mg/kg
Low
- Color
- Colorless and clear
- Taste
- Tasteless
- Odor
- Odorless
Highlights
- High silica
- Top-decile hot
Analyzed Feb 10, 2022·一般社団法人 和歌山県薬剤師会 医薬品・公衆衛生検査センター·Cert no. 第E2202104号