Kowakien Kyokyu Onsen
Analysis VerifiedThe Kowakien Kyokyu Onsen is a steam-generated spring developed since 1949 to supply the Hakone Kowakien resort area. It utilizes geothermal heat from former fumarolic activity along the Kurumazawa stream, a tributary of the Jakotsu River, blending multiple sources and natural spring water. This source is widely distributed to the various facilities of the Hakone Kowakien resort, operated by Fujita Kanko, forming the foundation of the entire resort.
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 natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
- Chloride (salt)364 mg/kg
- Feel
- Tastes salty; the warmth lasts after you get out.
- Said to
- Salt is said to form a film on the skin that keeps in heat and moisture. Bathing indications include cuts, poor circulation and dry skin.
- Note
- May sting cuts. Strong salty water can tire you—avoid long soaks.
- Metasilicic acid121 mg/kg
- Feel
- Your skin may feel smoother.
- Said to
- 50 mg/kg or more is said to mark a “skin-beautifying spring”; it is also used in skincare.
- Note
- The “skin-beautifying” label is a common rule of thumb, not a legal standard.
- Source temperature76.5℃
- Feel
- The source is 42°C or hotter; the bath may be on the hot side.
- Said to
- Heat is said to boost circulation and warm the body.
- Note
- Older people and those with high blood pressure or heart conditions should avoid baths of 42°C or more. Keep soaks short.
Effects are general descriptions based on the Ministry of the Environment’s indications by spring type, not a guarantee.
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.
As the source temperature is high, facilities adjust it for comfortable bathing. Start by splashing water on your limbs to acclimate your body. Avoid long soaks; aim for 10-15 minute intervals with breaks in between for a relaxing experience.
With a neutral pH of 7.4, this spring offers a gentle bathing experience. The 364 mg/kg of chloride ions form a thin veil on the skin, preventing moisture loss and providing excellent restorative warmth. Additionally, a high metasilicic acid content of 121 mg/kg, known for promoting silky skin, helps to support skin turnover.
Avoid bathing during active illness, extreme exhaustion, or if you have severe heart or kidney disease. Refrain from bathing immediately after meals or after consuming alcohol.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Kowakien Kyokyu Onsen
- Spring type
- Sodium Chloride Hot Spring
- Old spring type name
- 純弱食塩泉
- Source temperature
- 76.5℃
- pH
- 7.4
- Flow type
- 蒸気造成温泉
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2017-03-03
- Analyst organization
- 神奈川県温泉地学研究所
- Registration No.
- 第1号
Cations
- Lithium ion Li⁺
- 0.26 mg/kg
- Sodium ion Na⁺
- 230 mg/kg
- Potassium ion K⁺
- 21.7 mg/kg
- Magnesium ion Mg²⁺
- 7.3 mg/kg
- Calcium ion Ca²⁺
- 36.1 mg/kg
- Aluminum ion Al³⁺
- 0.06 mg/kg
- Manganese ion Mn²⁺
- 1.2 mg/kg
- Iron(II) ion Fe²⁺
- 0.31 mg/kg
- Zinc ion Zn²⁺
- 0.03 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 0.21 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 297 mg/kg
Anions
- Fluoride ion F⁻
- 0.26 mg/kg
- Chloride ion Cl⁻
- 364 mg/kg
- Sulfate ion SO₄²⁻
- 93.0 mg/kg
- Bicarbonate ion HCO₃⁻
- 125 mg/kg
- Carbonate ion CO₃²⁻
- 0.27 mg/kg
- Bromide ion Br⁻
- 0.71 mg/kg
- Nitrate ion NO₃⁻
- 0.11 mg/kg
- Hydrogen metasilicate HSiO₃⁻
- 0.61 mg/kg
- Metaborate ion BO₂⁻
- 0.30 mg/kg
- Total anions
- 584 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 121 mg/kg
- Metaboric acid HBO₂
- 19.5 mg/kg
- Total undissociated
- 141 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 8.3 mg/kg
- Total dissolved gas
- 8.3 mg/kg
Totals
- Component total
- 1031 mg/kg
- Evaporation residue
- 904 mg/kg
Usage
- Heating
- No
- Dilution
- Yes（Water is added to maintain a suitable temperature for bathing.）
- 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
