Izumi-go-i
Analysis VerifiedThe Izumi Gōi Gensen is the vital source supporting Onneyu Onsen, a renowned hot spring in Hokkaido, whose name translates to "large hot water" in the Ainu language. Since its establishment in 1899, this region has been cherished as a "skin-beautifying spring." The thick, highly alkaline water from this source gently envelops the skin, leaving it remarkably smooth and silky after bathing, as if adorned with a delicate veil. It is an ideal spring for those wishing to experience nature's blessings and enhance their skin's condition.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
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 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
- Izumi-go-i
- 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
- 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
- Drinking notes
- This hot spring is not used for drinking.
