玉川鉱泉
Tamagawa Mineral Spring湯
Simple
Sodium Bicarbonate-Carbonate-HSiO3 spring
Cold mineral source · 23°CStrongly alkalineCold mineral
Composition fingerprint0.2 g/kg dissolved · Hypotonic
Na⁺97
HCO₃⁻25
CO₃²⁻23
HSiO₃⁻20
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
Known good for
- Smooth skindry, rough skin
- Recoveryfatigue, stress
The water comes from the Tamagawa mineral spring, a wellhead in the Tamagawa district of Imabari, Ehime. At under 25 °C it is a cold-mineral source, so it is reheated for bathing. It is strongly alkaline and leaves the slippery, soft-skinned feel of Japan's beauty-water family, though the dissolved load is very light — the posted analysis records no spring-quality name at all (hypotonic, alkaline, cold mineral spring), meaning the water falls short of therapeutic-spring thresholds. The same posting states the baths are diluted with water, recirculated through a filtration unit, and disinfected with chlorine-based agents to meet Matsuyama City's public bath standards.
Analyzed Aug 22, 2022·愛媛県立衛生環境研究所
