Biratori Onsen Source
Analysis UnverifiedBiratori has bathed in cold mineral water since 1979, first trucking in water that seeped naturally across the river. In 2011 a 1,503 m borehole was sunk at Nibutani on the Saru River, a place that still carries Ainu culture, and tapped a new cold spring. At 12.1°C and a mildly alkaline pH 8.3, it holds 22.06 g/kg of minerals, led by 6,303 mg of sodium, 2,016 mg of calcium and 13,400 mg of chloride, close to seawater in strength. Clear, colorless and intensely salty, it feels like ancient sea water sleeping deep beneath Hokkaido.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").
Above 10 mg classifies the spring as an "iodine spring" — a rare type that delivers antibacterial and anti-inflammatory action through the skin.
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
Absorbed through the skin to gently calm nervous tension, leaving deep relaxation after the bath.
Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor 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.
The 12.1°C source is heated for bathing. Its very high salt content can tire you quickly, so take several short soaks, rinse lightly with fresh water afterward to prevent dryness, and watch your step on the slippery floor.
With 13,400 mg/kg of chloride, this hypertonic water is traditionally associated with restorative warmth: a salt film on the skin slows heat loss, keeping you warm long after bathing, and it may support relief of pain from stiffness and chill.
With over 22 g/kg of dissolved minerals, long soaks can cause dizziness or bath fatigue. Those with sensitive skin should rinse afterward, and people with acute illness, serious heart disease or kidney failure should avoid bathing.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Biratori Onsen Source
- Spring type
- Sodium-Calcium Chloride strong saline Cold Mineral Spring
- Old spring type name
- 強食塩泉
- Source temperature
- 12.1℃
- pH
- 8.3
- Flow rate
- 30 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 高張性
Analysis Document
- Analysis date
- 2012-03-06
- 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⁺
- 6303 mg/kg
- Potassium ion K⁺
- 28.4 mg/kg
- Ammonium ion NH₄⁺
- 7.1 mg/kg
- Magnesium ion Mg²⁺
- 45.1 mg/kg
- Calcium ion Ca²⁺
- 2016 mg/kg
- Manganese ion Mn²⁺
- 0.50 mg/kg
- Iron(II) ion Fe²⁺
- 0.20 mg/kg
- Iron(III) ion Fe³⁺
- 0.20 mg/kg
- Strontium ion Sr²⁺
- 6.0 mg/kg
- Barium ion Ba²⁺
- 1.3 mg/kg
- Total cations
- 8.4 mg/kg
Anions
- Fluoride ion F⁻
- 0.20 mg/kg
- Chloride ion Cl⁻
- 13400 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 55.1 mg/kg
- Bicarbonate ion HCO₃⁻
- 54.1 mg/kg
- Carbonate ion CO₃²⁻
- 13.6 mg/kg
- Bromide ion Br⁻
- 52.6 mg/kg
- Iodide ion I⁻
- 11.6 mg/kg
- Total anions
- 13.6 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 12.1 mg/kg
- Metaboric acid HBO₂
- 53.1 mg/kg
- Total undissociated
- 0.07 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.40 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 22.1 mg/kg
- Component total
- 22.1 mg/kg
- Evaporation residue
- 22.1 mg/kg
Usage
- Heating
- Yes（北海道・源泉マニアの突撃入湯レポ https://t2412.livedoor.blog/archives/1979099.html（2019年7月訪問）の浴室見取図掲示写真（17c36f92.jpg）「2.加温の状況」『加温しています 理由…入浴に適した温度に保つ為に加温しています』。）
- Dilution
- Yes（北海道・源泉マニアの突撃入湯レポ https://t2412.livedoor.blog/archives/1979099.html（2019年7月訪問）の浴室見取図掲示写真（17c36f92.jpg）「1.加水の状況」『温泉高温湯風呂…加水しております』『温泉露天風呂…加水しております』（温泉浴槽2つとも加水）。）
- Recycle / Filter
- Recycled / Filtered / 北海道・源泉マニアの突撃入湯レポ https://t2412.livedoor.blog/archives/1979099.html（2019年7月訪問）の浴室見取図掲示写真（17c36f92.jpg）「3.循環使用」『全ての浴槽で使用しています 理由…衛生管理と浴槽の温度を、均一に保つため、循環装置を使用しています。』
- Additives
- No
- Disinfection
- Yes（塩素系薬剤）
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
