Kowakidani Onsen Onsenmura No. 59-3 & No. 100 Combined Spring
Analysis VerifiedOnce a desolate area called "Lesser Hell," this land was renamed Kowakidani following a visit by Emperor Meiji, sparking its development as a hot spring resort. This combined source is one of several springs utilized in this historic onsen town. Developed by entrepreneurs in the Meiji era, the area saw the construction of numerous inns and villas. This very source has supplied water to accommodations throughout the Kowakidani area, laying the foundation for Hakone's modern onsen 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 natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
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 is a simple thermal spring with a gentle, weakly alkaline pH of 8.4. While suitable for longer soaks, it's best to start with 10-15 minute dips to acclimate your body. Rich in metasilicic acid, it leaves the skin feeling moist. For best results, gently pat dry without rinsing off the water.
With a pH of 8.4, this weakly alkaline water gently softens the skin's surface, which is traditionally associated with promoting silky skin. Furthermore, containing a rich 169 mg/kg of metasilicic acid—a key indicator of "skin-beautifying" springs—it may leave your skin feeling naturally moisturized. It's the perfect spring for deep relaxation on days you need to unwind.
Avoid bathing during active phases of illness or if extremely weak. Bathing after consuming alcohol is particularly dangerous and should be strictly avoided. Pay attention to water temperature and bathing time for a safe experience.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Kowakidani Onsen Onsenmura No. 59-3 & No. 100 Combined Spring
- Spring type
- Simple Hot Spring
- Source temperature
- 74℃
- pH
- 8.4
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2018-11-08
- Analyst organization
- 一般社団法人北里環境科学センター
- Registration No.
- 神奈川県知事登録 第2号
Cations
- Lithium ion Li⁺
- 0.04 mg/kg
- Sodium ion Na⁺
- 137 mg/kg
- Potassium ion K⁺
- 10.4 mg/kg
- Magnesium ion Mg²⁺
- 13.5 mg/kg
- Calcium ion Ca²⁺
- 35.5 mg/kg
- Aluminum ion Al³⁺
- 0.01 mg/kg
- Manganese ion Mn²⁺
- 0.01 mg/kg
- Iron(II) ion Fe²⁺
- 0.00 mg/kg
- Iron(III) ion Fe³⁺
- 0.00 mg/kg
- Zinc ion Zn²⁺
- 0.01 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 0.12 mg/kg
- Barium ion Ba²⁺
- 0.03 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Total cations
- 0.20 mg/kg
Anions
- Fluoride ion F⁻
- 0.00 mg/kg
- Chloride ion Cl⁻
- 141 mg/kg
- Sulfate ion SO₄²⁻
- 76.4 mg/kg
- Bicarbonate ion HCO₃⁻
- 206 mg/kg
- Carbonate ion CO₃²⁻
- 15.6 mg/kg
- Bromide ion Br⁻
- 0.00 mg/kg
- Nitrate ion NO₃⁻
- 0.40 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.20 mg/kg
- Total anions
- 0.44 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 169 mg/kg
- Metaboric acid HBO₂
- 6.7 mg/kg
- Total undissociated
- 0.18 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 1.4 mg/kg
Totals
- Total dissolved substances
- 0.81 mg/kg
- Component total
- 0.81 mg/kg
- Evaporation residue
- 0.62 mg/kg
Usage
- Heating
- Yes（Heated to maintain a suitable temperature for bathing.）
- Dilution
- Yes（Diluted with water to maintain a suitable temperature for bathing.）
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- Yes（Chlorine-based disinfectants are used for sanitation purposes.）
Indications & Contraindications
- Bathing indications
- Chronic pain or stiffness in muscles and joints (chronic stage of rheumatoid arthritis, osteoarthritis, low back pain, neuralgia, frozen shoulder, bruises, sprains), Muscle stiffness due to motor paralysis, Poor circulation, Gastrointestinal dysfunction (stomach heaviness, intestinal gas), High blood pressure (mild), Impaired glucose tolerance (diabetes), Dyslipidemia, Mild asthma or emphysema, Hemorrhoids, Autonomic instability, Stress-related symptoms (insomnia, depression), Post-illness recovery, Fatigue recovery, Health promotion, Autonomic instability, Insomnia, Depression
- Contraindications
- Active phases of illness (especially with fever), active tuberculosis, advanced malignant tumors or severe anemia with significant physical debilitation, serious heart or lung diseases that cause shortness of breath with slight movement, serious kidney diseases with edema, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic illness
Drinking
- Drinkability
- Not drinkable
