Izumi-go-i
Analysis VerifiedOnneyu Onsen, whose name means "large hot spring" in the Ainu language, is a famed Hokkaido spa renowned for its abundant waters. The Izumi-go-i source is one of the springs that upholds the area's legacy as a "skin-beautifying" destination, cherished since its opening in 1899. Its clear, highly alkaline water gently exfoliates the skin, leaving it with a silky-smooth feel. This source provides 100% pure, natural hot spring water—never heated, diluted, or recirculated—to soothe the body and soul of its visitors.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Gentle antibacterial action that conditions the skin.
Slightly alkaline, softening dead skin cells.
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.
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 high alkalinity of pH 9.17, this water is excellent for exfoliating and smoothing the skin. However, prolonged bathing can strip natural oils and cause dryness, so limit each soak to 10-15 minutes. Moisturizing after your bath is highly recommended for best results.
Its standout feature is the exceptionally high pH of 9.17, which acts like a natural soap to dissolve old skin cells, leaving your skin feeling incredibly smooth. The water temperature of 45.7°C provides deep warmth, perfect for soothing chronic muscle and joint pain, promoting recovery, and guiding you into a state of deep relaxation.
Avoid bathing during active illness, if you are extremely weak, or if you have sensitive skin or mucous membranes. This hot spring is not suitable for drinking.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- いずほ3号井
- Spring type
- アルカリ性単純温泉
- Source temperature
- 45.7℃
- pH
- 9.2
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2019-11-11
- Analyst organization
- 株式会社 ホクカン 環境化学分析センター
- Registration No.
- 温泉 第 19-010 号
Cations
- Sodium ion Na⁺
- 102 mg/kg
- Potassium ion K⁺
- 0.90 mg/kg
- Ammonium ion NH₄⁺
- 0.20 mg/kg
- Magnesium ion Mg²⁺
- 0.00 mg/kg
- Calcium ion Ca²⁺
- 3.4 mg/kg
- Iron(II) ion Fe²⁺
- 0.20 mg/kg
- Total cations
- 0.11 mg/kg
Anions
- Fluoride ion F⁻
- 5.6 mg/kg
- Chloride ion Cl⁻
- 81.7 mg/kg
- Hydroxide ion OH⁻
- 0.30 mg/kg
- Sulfate ion SO₄²⁻
- 31.1 mg/kg
- Bicarbonate ion HCO₃⁻
- 44.6 mg/kg
- Carbonate ion CO₃²⁻
- 17.4 mg/kg
- Metaborate ion BO₂⁻
- 3.5 mg/kg
- Total anions
- 0.18 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 43.1 mg/kg
- Metaboric acid HBO₂
- 0.00 mg/kg
- Total undissociated
- 0.04 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 0.33 mg/kg
- Component total
- 0.33 mg/kg
- Evaporation residue
- 0.32 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, lower back pain, neuralgia, frozen shoulder, bruises, sprains, etc.), Muscle stiffness due to motor paralysis, Poor circulation, Peripheral circulatory failure, Gastrointestinal dysfunction, High blood pressure (mild), Impaired glucose tolerance (diabetes), Dyslipidemia (mild), Mild asthma or emphysema, Hemorrhoid pain, Autonomic instability, Stress-related symptoms (insomnia, depression), Convalescence, Fatigue recovery, Health promotion, Insomnia, Depression
- General indications
- Chronic pain or stiffness in muscles and joints (rheumatoid arthritis, osteoarthritis, lower back pain, neuralgia, frozen shoulder, bruises, sprains, etc.), Muscle stiffness due to motor paralysis, Poor circulation, Peripheral circulatory failure, Gastrointestinal dysfunction, High blood pressure (mild), Impaired glucose tolerance (diabetes), Dyslipidemia (mild), Mild asthma or emphysema, Hemorrhoid pain, Autonomic instability, Stress-related symptoms (insomnia, depression), Convalescence, Fatigue recovery, Health promotion
- Contraindications
- Active stages of illness (especially with fever), active tuberculosis, advanced malignant tumors or severe anemia, severe heart or lung disease causing shortness of breath with light activity, severe kidney disease with swelling, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic illness.
Drinking
- Drinkability
- Not drinkable
- Drinking notes
- This hot spring is not used for drinking.
