府内温泉
Funai OnsenOperated by · 株式会社サイエンス
曹
Bicarbonate
- Color
- medium yellow-brown and transparent
- Taste
- tasteless
- Odor
- moderate mineral odor
Sodium spring
pH 8.6Weakly alkalineHot source · 51°CHigh silica
Composition fingerprint1.2 g/kg dissolved · Hypotonic
Na⁺91
F⁻2
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Fluoride F⁻
- trace; drinking limits apply.
Known good for
- Smooth skindry, rough skin
- Aches & jointsstiff shoulders
- Recoveryfatigue, stress
A sodium-led bicarbonate spring — the classic jūsō-sen (soda-water) style, weakly alkaline and soft on the skin, placing it in Japan's beauty-water family. The source emerges hot at over 51 °C; the water is medium yellow-brown and clear with a moderate mineral note. A generous 198 mg/kg of metasilicic acid leaves the kind of silica film that makes skin feel noticeably smoother afterwards.
Sampled at wellhead·Analyzed Sep 30, 2021·公益社団法人大分県薬剤師会検査センター·Cert no. 大薬第 72-21060010号