Tsurumaki Onsen (Hadano No. 12)
Analysis VerifiedTsurumaki Onsen's non-volcanic waters, first utilized for bathing in 1889 after well water proved undrinkable, emerge from deep within the Tanzawa Mountains. This spring is a national rarity, exceptionally rich in calcium, gently enveloping the skin. Its restorative warmth penetrates the body's core, fostering deep relaxation and a lasting gentle glow post-bath. Following its history as 'Tokyo's inner parlor,' bustling with therapeutic bathers after the Odakyu Line opened in the early Showa era, it remains ideal for tranquil self-care away from urban clamor.
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.
This weakly alkaline chloride spring helps prevent post-bath chills as salt adheres to the skin, retaining warmth. For lasting moisture, avoid rinsing off after your bath. Refrain from prolonged soaking and remember to stay hydrated.
With a pH of 7.7, this spring contains 160.5 mg/kg of calcium ions and 539.0 mg/kg of chloride ions. A "salt veil" envelops the body, preventing chills, making it ideal for those with poor circulation. It's also beneficial for cuts and dry skin, offering relief on days your skin needs extra care.
Avoid bathing during active phases of illness or if you have severe heart or kidney disease. Bathing after consuming alcohol is dangerous and should be avoided. Remember to hydrate before and after your bath.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Tsurumaki Onsen (Hadano No. 12)
- Spring type
- ナトリウム・カルシウム－塩化物冷鉱泉
- Source temperature
- 20.6℃
- pH
- 7.7
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2021-01-08
- Analyst organization
- 株式会社 エオネックス
- Registration No.
- 石川県登録 第3号
Cations
- Lithium ion Li⁺
- 0.00 mg/kg
- Sodium ion Na⁺
- 230 mg/kg
- Potassium ion K⁺
- 2.1 mg/kg
- Ammonium ion NH₄⁺
- 0.00 mg/kg
- Magnesium ion Mg²⁺
- 7.4 mg/kg
- Calcium ion Ca²⁺
- 161 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 0.00 mg/kg
- Iron(II) ion Fe²⁺
- 0.00 mg/kg
- Iron(III) ion Fe³⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 0.00 mg/kg
- Barium ion Ba²⁺
- 0.00 mg/kg
- Total cations
- 0.40 mg/kg
Anions
- Fluoride ion F⁻
- 0.00 mg/kg
- Chloride ion Cl⁻
- 539 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.30 mg/kg
- Sulfate ion SO₄²⁻
- 45.3 mg/kg
- Bicarbonate ion HCO₃⁻
- 98.4 mg/kg
- Carbonate ion CO₃²⁻
- 0.40 mg/kg
- Bromide ion Br⁻
- 1.7 mg/kg
- Iodide ion I⁻
- 0.10 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Total anions
- 0.69 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 0.00 mg/kg
- Metasilicic acid H₂SiO₃
- 58.4 mg/kg
- Metaboric acid HBO₂
- 1.5 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 14.8 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
Totals
- Total dissolved substances
- 1.1 mg/kg
- Component total
- 1.2 mg/kg
- Evaporation residue
- 1.3 mg/kg
Usage
- Heating
- Yes（To heat the water to a suitable temperature for bathing.）
- Dilution
- Yes（Equipped for adding water in case of emergencies.）
- Recycle / Filter
- Recycled / For hygiene management and effective use of hot spring resources.
- Additives
- No
- Disinfection
- Yes（Chlorine-based chemicals are used for hygiene management.）
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
