Yumoto Onsen (Oga)
Analysis UnverifiedTemple records say this spring has flowed for more than 600 years, and the lords of the Akita domain and the travel writer Sugae Masumi are said to have bathed here. Travertine thousands of years old has been found nearby. Rich in sodium (1,794 mg), chloride (2,970 mg), calcium (318.9 mg) and bicarbonate (996.3 mg), it builds mineral crust on the tub edges. It is like a seasoned master of the old healing-bath tradition.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
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 source is a hot 53.5°C, so the bath tends to run hot. Pour water over yourself first, keep full immersion short and alternate with half-body soaks. Neutral at pH 7.0 it is gentle, but the salty water keeps you sweating, so drink water afterward.
With 2,970 mg of chloride, this strong salt spring leaves a thin film on the skin that holds in heat for lasting restorative warmth. The deep, steady warmth can also help relieve pain from chills and stiff joints.
The hot source and hot bath can cause dizziness, dehydration or scalding during long soaks. People with acute illness or heart or blood pressure concerns should bathe briefly or avoid bathing. Drinking suitability is not confirmed.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Yumoto Onsen (Oga)
- Spring type
- Sodium Chloride Hot Spring
- Old spring type name
- 食塩泉
- Source temperature
- 53.5℃
- pH
- 7
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2015-07-15
- Analyst organization
- 株式会社 秋田県分析化学センター
- Registration No.
- 秋田第2号
Cations
- Lithium ion Li⁺
- 4.0 mg/kg
- Sodium ion Na⁺
- 1794 mg/kg
- Potassium ion K⁺
- 130 mg/kg
- Ammonium ion NH₄⁺
- 0.10 mg/kg
- Magnesium ion Mg²⁺
- 107 mg/kg
- Calcium ion Ca²⁺
- 319 mg/kg
- Aluminum ion Al³⁺
- < 0.1 mg/kg
- Manganese ion Mn²⁺
- 0.10 mg/kg
- Iron(II) ion Fe²⁺
- < 0.1 mg/kg
- Iron(III) ion Fe³⁺
- 0.50 mg/kg
- Zinc ion Zn²⁺
- < 0.1 mg/kg
- Lead ion Pb²⁺
- < 0.05 mg/kg
- Strontium ion Sr²⁺
- 8.4 mg/kg
- Barium ion Ba²⁺
- 0.10 mg/kg
- Copper ion Cu²⁺
- < 0.1 mg/kg
- Cadmium ion Cd²⁺
- < 0.005 mg/kg
- Total cations
- 2.4 mg/kg
Anions
- Fluoride ion F⁻
- 0.50 mg/kg
- Chloride ion Cl⁻
- 2970 mg/kg
- Hydroxide ion OH⁻
- < 0.1 mg/kg
- Hydrogen sulfide ion HS⁻
- < 0.1 mg/kg
- Thiosulfate ion S₂O₃²⁻
- < 0.1 mg/kg
- Sulfate ion SO₄²⁻
- 262 mg/kg
- Bicarbonate ion HCO₃⁻
- 996 mg/kg
- Bromide ion Br⁻
- 8.2 mg/kg
- Iodide ion I⁻
- 0.50 mg/kg
- Nitrate ion NO₃⁻
- 0.40 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.90 mg/kg
- Total anions
- 4.2 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- < 0.1 mg/kg
- Arsenious acid HAsO₂
- 0.20 mg/kg
- Metasilicic acid H₂SiO₃
- 118 mg/kg
- Metaboric acid HBO₂
- 52.9 mg/kg
- Total undissociated
- 0.17 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 149 mg/kg
- Free hydrogen sulfide H₂S
- < 0.1 mg/kg
- Total dissolved gas
- 0.15 mg/kg
Totals
- Total dissolved substances
- 6.8 mg/kg
- Component total
- 6.9 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, 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
