鉄輪温泉管理組合
Kannawa Onsen Kanri Kumiai SpringOperated by · 鉄輪温泉管理組合
湯
Simple
- Color
- colorless, very faintly cloudy white
- Taste
- very faintly sour
- Odor
- moderate hydrogen sulfide odor
Sodium-Calcium Sulfate-Chloride spring
pH 4.2Weakly acidicHot source · 70°CHigh silica
Composition fingerprint0.4 g/kg dissolved · Hypotonic
Na⁺49
Ca²⁺30
SO₄²⁻59
Cl⁻40
◀ 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
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A simple thermal spring drawn at the storage-tank outlet in Kannawa. It is lightly mineralized at 385 mg/kg and gentle on the body, yet emerges piping hot at 69.9 °C — among the hotter natural sources. Weakly acidic with a faint hydrogen sulfide note, it carries 124 mg/kg of metasilicic acid, leaving a thin silica film that makes the skin feel noticeably smoother — close to the Japanese beauty-water family.
Sampled at mixing tank·Analyzed Sep 21, 2021·公益社団法人大分県薬剤師会検査センター·Cert no. 大薬検 第 7R-21090009号