Futamata Onsen (Mixed Wells No. 1A, B, 2-7)
Analysis UnverifiedOpened in 1898 and later famed for its radium content, Futamata's water has deposited calcium carbonate for ages, building a 400-meter limestone dome. Mixed wells turn amber and cloudy in the air, with waxy mineral flakes floating on top; the rich salts have long warmed hot-spring cure guests deep in the valley.
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 "beauty spring" that gently emulsifies dead skin cells, leaving skin smooth 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 43.2°C water flows in as is, so inlet-side tubs run hotter and outlet-side ones cooler. At over 9 g/kg this dense chloride water can tire you quickly; soak briefly in a cooler tub, rest between dips, and mind your footing in the deep standing bath.
With 3980 mg/kg chloride, the salts form a light film on the skin that holds heat after bathing, offering restorative warmth in the cold mountains, while 619 mg/kg calcium makes a mellow soak that may help relieve pain in stiff bodies.
This concentrated chloride water can cause fatigue on long soaks. A standing bath is 120 cm deep, so watch your footing. Rinse with fresh water afterward to avoid salt itch, and do not drink the water.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Futamata Onsen (Mixed Wells No. 1A, B, 2-7)
- Spring type
- Sodium-Calcium Chloride Spring
- Old spring type name
- 塩化土類－食塩泉
- Source temperature
- 43.2℃
- pH
- 7.1
- Flow type
- 自然湧出
- Osmotic pressure
- 等張性
Analysis Document
- Analysis date
- 2002-08-14
- Analyst organization
- 財団法人 北海道薬剤師会公衆衛生検査センター
- Registration No.
- 北海道第2号
Cations
- Sodium ion Na⁺
- 1970 mg/kg
- Potassium ion K⁺
- 543 mg/kg
- Ammonium ion NH₄⁺
- 2.8 mg/kg
- Magnesium ion Mg²⁺
- 112 mg/kg
- Calcium ion Ca²⁺
- 619 mg/kg
- Aluminum ion Al³⁺
- not detected
- Manganese ion Mn²⁺
- 0.40 mg/kg
- Iron(II) ion Fe²⁺
- 1.0 mg/kg
- Iron(III) ion Fe³⁺
- 0.10 mg/kg
- Zinc ion Zn²⁺
- not detected
- Lead ion Pb²⁺
- not detected
- Copper ion Cu²⁺
- not detected
- Cadmium ion Cd²⁺
- not detected
- Total cations
- 3.2 mg/kg
Anions
- Fluoride ion F⁻
- 0.20 mg/kg
- Chloride ion Cl⁻
- 3980 mg/kg
- Sulfate ion SO₄²⁻
- 92.6 mg/kg
- Bicarbonate ion HCO₃⁻
- 1598 mg/kg
- Carbonate ion CO₃²⁻
- 1.6 mg/kg
- Nitrate ion NO₃⁻
- 0.90 mg/kg
- Total anions
- 5.7 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 61.6 mg/kg
- Metaboric acid HBO₂
- 175 mg/kg
- Total undissociated
- 0.24 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 161 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.16 mg/kg
Trace Components
- Radon Rn
- 5.8 Bq/kg
Totals
- Total dissolved substances
- 9.2 mg/kg
- Component total
- 9.3 mg/kg
- Evaporation residue
- 8.4 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
