Sanso Tensui Gensen
Analysis VerifiedThe Sanso Tensui source is a private spring nestled in the mountains of Amagase Onsen, one of Oita's three great hot springs alongside Beppu and Yufuin. Established in 1995 on a vast 10,000-tsubo (approx. 33,000 m²) estate overlooking the famous Sakurataki Falls, this relatively new source gushes forth pure, heavenly water. The high-temperature 64.5°C spring water is used free-flowing with added cool water, known for its gentle, smooth touch on the skin. Surrounded by the murmur of a clear stream and lush greenery, it offers deep healing and tranquility to those wishing to escape the city's hustle and bustle.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
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.
The spring is 64.5°C, so cool water is added to adjust the temperature. Acclimatize your body with "kake-yu" (scooping and pouring hot water on yourself) before slowly entering the bath. The neutral pH of 7.3 is gentle on the skin, making it suitable for longer soaks, but taking breaks will prevent overheating and enhance the therapeutic effects.
Rich in metasilicic acid at 157.0 mg/kg, this simple thermal spring acts as a natural moisturizer, expected to lead to soft, "silky skin" after bathing. Its gentle, neutral pH of 7.3 makes it perfect for days when you need to unwind both mind and body. As part of a balneotherapy routine, it is recommended for those seeking to relieve daily fatigue and achieve deep relaxation.
Please refrain from bathing if you have general contraindications for hot springs (e.g., acute illness, severe heart disease, bleeding disorders, pregnancy). The water is not for drinking.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Sanso Tensui Gensen
- Spring type
- Simple Hot Spring
- Old spring type name
- 単純温泉
- Source temperature
- 64.5℃
- pH
- 7.3
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2021-03-16
- Valid until
- 2031-03-23
- Analyst organization
- 公益社団法人大分県薬剤師会
- Registration No.
- 大分県第3号
Cations
- Lithium ion Li⁺
- 0.60 mg/kg
- Sodium ion Na⁺
- 214 mg/kg
- Potassium ion K⁺
- 15.2 mg/kg
- Ammonium ion NH₄⁺
- 0.70 mg/kg
- Magnesium ion Mg²⁺
- 1.3 mg/kg
- Calcium ion Ca²⁺
- 12.5 mg/kg
- Strontium ion Sr²⁺
- 0.30 mg/kg
- Total cations
- 0.24 mg/kg
Anions
- Fluoride ion F⁻
- 6.0 mg/kg
- Chloride ion Cl⁻
- 266 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.70 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 1.0 mg/kg
- Sulfate ion SO₄²⁻
- 61.2 mg/kg
- Bicarbonate ion HCO₃⁻
- 89.8 mg/kg
- Bromide ion Br⁻
- 0.70 mg/kg
- Total anions
- 0.43 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.00 mg/kg
- Metasilicic acid H₂SiO₃
- 157 mg/kg
- Metaboric acid HBO₂
- 12.6 mg/kg
- Total undissociated
- 0.17 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 23.8 mg/kg
- Free hydrogen sulfide H₂S
- 0.40 mg/kg
- Total dissolved gas
- 0.02 mg/kg
Totals
- Total dissolved substances
- 0.84 mg/kg
- Component total
- 0.86 mg/kg
- Evaporation residue
- 0.78 mg/kg
Usage
- Heating
- No
- Dilution
- Yes（Water is added to cool the high-temperature source water to a comfortable bathing temperature.）
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Autonomic instability, Insomnia, Depression, Chronic pain or stiffness in muscles and joints (chronic rheumatoid arthritis, osteoarthritis, low back pain, neuralgia, frozen shoulder, bruises, sprains), muscle stiffness due to motor paralysis, poor circulation, gastrointestinal dysfunction (stomach heaviness, gas), mild high blood pressure, impaired glucose tolerance (diabetes), mild dyslipidemia, mild asthma or emphysema, hemorrhoid pain, autonomic instability, stress-related symptoms (insomnia, depression), post-illness recovery, fatigue recovery, health promotion
- 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), Active stages of illness (especially with fever), active tuberculosis, advanced malignant tumors or severe anemia causing significant physical weakness, severe heart or lung disease causing shortness of breath with slight movement, severe kidney disease with edema, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic illness
Drinking
- Drinkability
- Not drinkable
