Kumanotearaiyu Gensen
Analysis UnverifiedKumanotearaiyu Gensen takes its name from a legend of a wounded bear, fleeing hunters, that soothed its injuries in these waters, and it is regarded as the birthplace of Nozawa Onsen. Said to have been opened in the Kamakura period, the spring still gushes naturally at 251 liters per minute. Its clear water carries a faint sulfur scent and leaves the skin smooth, with a light, refreshed feeling that lingers after bathing — a fitting soak for travelers tracing the roots of Nozawa's bathing culture.
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.
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.
At a mild 41.8°C with soft alkaline water, this spring suits an unhurried 10–15 minute soak. The sulfur scent can linger on skin, so rinse lightly if you prefer and moisturize afterward.
With pH 8.9 alkalinity and 11.4 mg/kg of hydrosulfide ion, this sulfur spring is traditionally associated with immune system stimulation in balneotherapy. Metasilicic acid at 90.9 mg/kg adds a smooth touch that may support silky skin — ideal on days you want to care for a tired body.
Sulfur compounds may tarnish silver and other metal jewelry, so remove it before bathing. Avoid long soaks and bathing after drinking alcohol.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Kumanotearaiyu Gensen
- Spring type
- Alkaline Simple Sulfur Hot Spring (Hypotonic Alkaline 温 泉)
- Source temperature
- 41.8℃
- pH
- 8.9
- Flow rate
- 251 L/min
- Flow type
- 自然湧出
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2016-06-28
- Analyst organization
- 環境未来株式会社 総合検査センター
- Registration No.
- 長野県第6号
Cations
- Sodium ion Na⁺
- 88.4 mg/kg
- Potassium ion K⁺
- 1.4 mg/kg
- Ammonium ion NH₄⁺
- 0.40 mg/kg
- Calcium ion Ca²⁺
- 10.8 mg/kg
- Lead ion Pb²⁺
- not detected
- Cadmium ion Cd²⁺
- not detected
- Total cations
- 0.10 mg/kg
Anions
- Fluoride ion F⁻
- 0.60 mg/kg
- Chloride ion Cl⁻
- 42.6 mg/kg
- Hydroxide ion OH⁻
- 0.10 mg/kg
- Hydrogen sulfide ion HS⁻
- 11.4 mg/kg
- Sulfate ion SO₄²⁻
- 113 mg/kg
- Bicarbonate ion HCO₃⁻
- 30.5 mg/kg
- Carbonate ion CO₃²⁻
- 9.0 mg/kg
- Bromide ion Br⁻
- 0.20 mg/kg
- Total anions
- 0.21 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 90.9 mg/kg
- Metaboric acid HBO₂
- 3.8 mg/kg
- Total undissociated
- 0.09 mg/kg
Dissolved Gas
- Free hydrogen sulfide H₂S
- 0.20 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 0.40 mg/kg
- Component total
- 0.40 mg/kg
- Evaporation residue
- 0.40 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, Chronic eczema, Epidermal suppuration, 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), Severe chronic dermatitis (sulphur springs)
Drinking
- Drinkability
- Not drinkable
