Dogo Onsen Dai-ni Bun'yujo
Analysis UnverifiedDogo Onsen appears in the ancient Iyo Fudoki and ranks among Japan's oldest hot springs. Its original natural spring has long dried up, so drilled wells are now blended at distribution stations. The Dai-ni Bun'yujo station on Kanmuriyama mixes waters of varying temperature and sends them to the heart of the spa town. The smooth alkaline water soothes the skin and leaves a gentle, lingering warmth, suiting travelers who want history and quiet rest.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.
A trace component with gentle antibacterial and anti-inflammatory action.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
▸Note
The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.
At pH 9.1 the alkaline water softens the skin, so gentle hand strokes are enough. The bath can feel slightly hot; pour water over yourself first and take a few short soaks.
With pH 9.1 and 49.8 mg/kg of metasilicic acid, this mild alkaline water is traditionally associated with silky skin, and its low mineral content makes it a fine choice for deep relaxation at day's end.
Avoid bathing during acute illness or with serious heart conditions. The bath runs around 42°C, so skip long soaks and bathing after drinking.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Dogo Onsen Dai-ni Bun'yujo
- Spring type
- Alkaline Simple Hot Spring
- Source temperature
- 47.8℃
- pH
- 9.1
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2014-01-09
- Analyst organization
- 愛媛県立衛生環境研究所
- Registration No.
- 第1号
Cations
- Lithium ion Li⁺
- 0.10 mg/kg
- Sodium ion Na⁺
- 72.2 mg/kg
- Potassium ion K⁺
- 1.3 mg/kg
- Ammonium ion NH₄⁺
- < 0.1 mg/kg
- Magnesium ion Mg²⁺
- < 0.1 mg/kg
- Calcium ion Ca²⁺
- 3.4 mg/kg
- Aluminum ion Al³⁺
- < 0.05 mg/kg
- Manganese ion Mn²⁺
- < 0.005 mg/kg
- Iron(II) ion Fe²⁺
- < 0.05 mg/kg
- Iron(III) ion Fe³⁺
- < 0.05 mg/kg
- Zinc ion Zn²⁺
- < 0.005 mg/kg
- Lead ion Pb²⁺
- < 0.001 mg/kg
- Strontium ion Sr²⁺
- < 0.05 mg/kg
- Barium ion Ba²⁺
- < 0.1 mg/kg
- Copper ion Cu²⁺
- < 0.005 mg/kg
- Cadmium ion Cd²⁺
- < 0.0005 mg/kg
- Total cations
- 0.08 mg/kg
Anions
- Fluoride ion F⁻
- 12.6 mg/kg
- Chloride ion Cl⁻
- 28.3 mg/kg
- Hydroxide ion OH⁻
- 0.20 mg/kg
- Thiosulfate ion S₂O₃²⁻
- < 0.1 mg/kg
- Sulfate ion SO₄²⁻
- 21.4 mg/kg
- Bicarbonate ion HCO₃⁻
- 68.5 mg/kg
- Carbonate ion CO₃²⁻
- 6.1 mg/kg
- Bromide ion Br⁻
- < 0.1 mg/kg
- Iodide ion I⁻
- < 0.1 mg/kg
- Nitrite ion NO₂⁻
- < 0.1 mg/kg
- Nitrate ion NO₃⁻
- < 0.1 mg/kg
- Phosphate ion PO₄³⁻
- < 0.1 mg/kg
- Total anions
- 0.14 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 49.8 mg/kg
- Metaboric acid HBO₂
- 4.5 mg/kg
- Total undissociated
- 0.05 mg/kg
Dissolved Gas
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 0.27 mg/kg
- Component total
- 0.27 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- Yes（塩素系薬剤）
Indications & Contraindications
- Bathing indications
- Autonomic instability, Insomnia, Depression
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Chronic pain or stiffness in muscles and joints, Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Bleeding disorders, Severe anemia, Any actively progressing illness, Pregnancy (especially early and late stages)
Drinking
- Drinkability
- Not drinkable
