Hakone no Yu Kamon
Analysis VerifiedHakone Yumoto Onsen's history is said to date back to the Nara period, making it Hakone's oldest hot spring village. [2, 4] The Hakone no Yu Kamon source is a private spring drilled in this historic land. This sodium/calcium-chloride/sulfate spring follows in the tradition of famous waters once presented to the Shogun's family during the Edo period. [10] Its waters gently envelop the skin, providing a characteristic warmth that lingers long after bathing. It is recommended for those seeking to release mind and body in historic, nature-rich Hakone.
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.
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 source is a hot 64.6°C, so acclimate your body away from the water inlet. As a chloride spring with high heat retention, it prevents chills. Avoid long soaks; instead, take breaks. After bathing, a light rinse is sufficient.
Chloride (971 mg/kg) and sulfate (564 mg/kg) ions create a veil on the skin, preventing moisture evaporation after bathing. This provides lasting restorative warmth and invites deep relaxation. The gentle, weakly alkaline pH of 8.48 also makes it suitable for balneotherapy, traditionally associated with relieving pain.
Due to the high temperature, avoid long or sudden soaks and be cautious of dizziness. Refrain from bathing after drinking alcohol, as it is particularly dangerous. It is wise to avoid bathing if you are unwell.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Hakone no Yu Kamon
- Spring type
- Sodium-Calcium Chloride and Sulfate Hot Spring
- Old spring type name
- 含石膏－弱食塩泉
- Source temperature
- 64.6℃
- pH
- 8.3
- Flow rate
- 59 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2024-03-26
- Analyst organization
- 一般財団法人 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⁺
- 0.12 mg/kg
- Sodium ion Na⁺
- 569 mg/kg
- Potassium ion K⁺
- 12.0 mg/kg
- Magnesium ion Mg²⁺
- 0.00 mg/kg
- Calcium ion Ca²⁺
- 203 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 0.02 mg/kg
- Zinc ion Zn²⁺
- 0.00 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 0.96 mg/kg
- Barium ion Ba²⁺
- 0.00 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Total cations
- 0.79 mg/kg
Anions
- Fluoride ion F⁻
- 1.4 mg/kg
- Chloride ion Cl⁻
- 971 mg/kg
- Sulfate ion SO₄²⁻
- 564 mg/kg
- Bicarbonate ion HCO₃⁻
- 6.1 mg/kg
- Carbonate ion CO₃²⁻
- 9.6 mg/kg
- Bromide ion Br⁻
- 3.1 mg/kg
- Nitrate ion NO₃⁻
- 0.00 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.00 mg/kg
- Total anions
- 1.6 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 62.6 mg/kg
- Metaboric acid HBO₂
- 46.6 mg/kg
- Total undissociated
- 0.11 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 2.5 mg/kg
- Component total
- 2.5 mg/kg
- Evaporation residue
- 2.5 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Listed on the separate hot spring analysis table
- Contraindications
- Listed on the separate hot spring analysis table
Drinking
- Drinkability
- Not drinkable
