Namarikawa Onsen Well No. 5
Analysis UnverifiedYakumo Onsen lies in forested hills along the Namarikawa River on the Oshima Peninsula. Water from Namarikawa Onsen Well No. 5 is rich in chloride and bicarbonate and carries over 430 mg/kg of free carbon dioxide. On contact with air its iron turns reddish-brown, coating tub edges and rocks with rust-colored deposits. Slightly salty, it warms the body to the core while leaving the skin moist and smooth, suiting those who want a long, unhurried soak in mineral-rich water to the sound of the river.
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.
A "beauty spring" that gently emulsifies dead skin cells, leaving skin smooth after bathing.
Absorbed through the skin to gently promote peripheral circulation.
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.
This concentrated water warms quickly. Pour water over yourself first, start with about five minutes, and rest between soaks. Iron may tint skin and towels reddish. Drink water after bathing.
Its 899.0 mg/kg of chloride wraps the skin in restorative warmth, while 1,128 mg/kg of bicarbonate leaves it smooth, suiting chilly days or whenever you want to step out with silky skin.
Rich in minerals and very warming, so avoid lightheadedness from long soaks; those with heart or blood-pressure concerns should keep baths short.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Namarikawa Onsen Well No. 5
- Spring type
- Sodium Chloride and Bicarbonate Hot Spring
- Source temperature
- 44.6℃
- pH
- 6.4
- Flow rate
- 300 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2015-12-16
- Analyst organization
- 株式会社第一岸本臨床検査センター
- Registration No.
- 北海道第12号
Cations
- Sodium ion Na⁺
- 769 mg/kg
- Potassium ion K⁺
- 81.9 mg/kg
- Ammonium ion NH₄⁺
- not detected
- Magnesium ion Mg²⁺
- 45.0 mg/kg
- Calcium ion Ca²⁺
- 160 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 1.2 mg/kg
- Iron(II) ion Fe²⁺
- 3.4 mg/kg
- Zinc ion Zn²⁺
- not detected
- Lead ion Pb²⁺
- not detected
- Copper ion Cu²⁺
- not detected
- Cadmium ion Cd²⁺
- not detected
- Total cations
- 1.1 mg/kg
Anions
- Fluoride ion F⁻
- 0.40 mg/kg
- Chloride ion Cl⁻
- 899 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.10 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 240 mg/kg
- Bicarbonate ion HCO₃⁻
- 1128 mg/kg
- Carbonate ion CO₃²⁻
- 0.20 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 0.10 mg/kg
- Total anions
- 2.3 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 63.6 mg/kg
- Metaboric acid HBO₂
- 36.0 mg/kg
- Total undissociated
- 0.10 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 433 mg/kg
- Free hydrogen sulfide H₂S
- 0.60 mg/kg
- Total dissolved gas
- 0.43 mg/kg
Totals
- Total dissolved substances
- 3.4 mg/kg
- Component total
- 3.9 mg/kg
- Evaporation residue
- 3.0 mg/kg
Usage
- Heating
- No
- Dilution
- Yes（館内掲示『温泉の利用状況について』：加水あり（源泉温度が高いため）。）
- 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
