Yumoto Onsen Yumoto Dai-san-go
Analysis VerifiedHakone Yumoto Onsen, said to have been discovered in the Nara period, is home to Yumoto Onsen No. 3. This source quietly gushes from its location in the deepest part of the area, along the Sugumo River valley. Excavated as a horizontal tunnel during the Meiji period, this naturally gushing spring yields soft, alkaline waters that gently envelop the skin. After a bath, one can expect a feeling of lightness, both in body and mind. It continues to be cherished and utilized by surrounding onsen facilities, beloved by those seeking to quietly restore their body and mind amidst abundant nature.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
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.
With a pH of 8.9, this alkaline spring feels very soft on the skin. The water temperature is a pleasant 42.4°C, making it ideal for long, relaxing soaks with minimal strain on the body. Moisturizing after your bath will help maintain that silky smooth feeling.
With a pH of 8.9, this alkaline spring is expected to gently exfoliate old skin cells, leading to naturally silky skin after your bath. The pleasant 42.4°C temperature and gentle nature of this simple thermal spring are perfect for days when you seek deep relaxation, offering a form of balneotherapy to calm both mind and body.
Avoid bathing during active phases of illness, especially with a fever, or if you have severe heart or lung conditions. Refrain from bathing after consuming alcohol. Adjust your bathing time according to your physical condition.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Yumoto Onsen Yumoto Dai-san-go
- Spring type
- Alkaline Simple Hot Spring
- Source temperature
- 42.4℃
- pH
- 8.9
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2005-05-10
- Analyst organization
- 神奈川県温泉地学研究所
- Registration No.
- 第1号
Cations
- Hydrogen ion H⁺
- 0.00 mg/kg
- Lithium ion Li⁺
- 0.01 mg/kg
- Sodium ion Na⁺
- 145 mg/kg
- Potassium ion K⁺
- 1.6 mg/kg
- Ammonium ion NH₄⁺
- 0.00 mg/kg
- Magnesium ion Mg²⁺
- 0.27 mg/kg
- Calcium ion Ca²⁺
- 28.2 mg/kg
- Aluminum ion Al³⁺
- 0.02 mg/kg
- Manganese ion Mn²⁺
- 0.00 mg/kg
- Iron(II) ion Fe²⁺
- 0.05 mg/kg
- Strontium ion Sr²⁺
- 0.05 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Total cations
- 0.17 mg/kg
Anions
- Fluoride ion F⁻
- 0.28 mg/kg
- Chloride ion Cl⁻
- 135 mg/kg
- Hydroxide ion OH⁻
- 0.14 mg/kg
- Sulfate ion SO₄²⁻
- 142 mg/kg
- Bicarbonate ion HCO₃⁻
- 29.9 mg/kg
- Carbonate ion CO₃²⁻
- 1.8 mg/kg
- Bromide ion Br⁻
- 0.30 mg/kg
- Nitrate ion NO₃⁻
- 1.4 mg/kg
- Metasilicate ion SiO₃²⁻
- 7.1 mg/kg
- Metaborate ion BO₂⁻
- 2.4 mg/kg
- Total anions
- 0.32 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 45.5 mg/kg
- Metaboric acid HBO₂
- 5.0 mg/kg
- Total undissociated
- 0.05 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.06 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Component total
- 0.55 mg/kg
- Evaporation residue
- 0.54 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Chronic pain or stiffness in muscles and joints (rheumatoid arthritis, osteoarthritis, low back pain, neuralgia, frozen shoulder, bruises, sprains, etc. in chronic phase), Muscle stiffness due to motor paralysis, Poor circulation, Peripheral circulatory failure, Gastrointestinal dysfunction, High blood pressure (mild), Impaired glucose tolerance (diabetes), Dyslipidemia, Mild asthma or emphysema, Hemorrhoid pain, Autonomic instability, Symptoms caused by stress (insomnia, depression), Post-illness recovery, Fatigue recovery, Health promotion
- Contraindications
- Active stages of diseases (especially with fever), active tuberculosis, advanced malignant tumors or severe anemia, severe heart or lung disease causing shortness of breath with slight movement, severe kidney disease with swelling, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic diseases.
Drinking
- Drinkability
- Not drinkable
