Yumoto Onsen Mixed Spring (Register No. Yumoto 12, 72, 84, 89, 99, 112)
Analysis VerifiedNestled in the Hakone Yumoto area, Yumoto Onsen (a blend of sources No. 12, 72, 84, 89, 99, and 112) is a luxurious fusion of six distinct springs. It symbolizes the abundant water volume of Yumoto, which historically thrived as one of the ancient Hakone Seven Hot Springs. The chloride spring water, enveloping the skin like a delicate veil, delivers restorative warmth deep into the body's core. The lingering, cozy sensation after bathing gently promotes deep relaxation, easing away daily fatigue. This spring is recommended for those seeking to deeply warm their body and mind and indulge in tranquil moments.
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.
- Chloride (salt)1570 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 acid77.8 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 temperature63℃
- 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 water is used at a high temperature of 60.0°C, please pour water over yourself to adjust before entering. Do not rinse off afterward; simply towel dry to retain the salt's warming veil on your skin.
Rich in sodium (750mg/kg) and chloride (1570mg/kg), this spring forms a delicate veil of salt over the skin, preventing heat loss. The 63.0°C thermal energy and gently alkaline pH of 8.1 will thoroughly warm those suffering from poor circulation and xeroderma from the core.
Avoid bathing if you have an active fever, tuberculosis, advanced malignancies, or severe heart, lung, or kidney conditions. Elderly guests should avoid extended full-body immersion in high temperatures.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Yumoto Onsen Mixed Spring (Register No. Yumoto 12, 72, 84, 89, 99, 112)
- Spring type
- Sodium-Calcium Chloride Hot Spring
- Old spring type name
- 含塩化土類-食塩泉
- Source temperature
- 63℃
- pH
- 8.1
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2013-09-01
- Analyst organization
- 一般財団法人 北里環境化学センター
- Registration No.
- 第2号
Cations
- Lithium ion Li⁺
- 0.34 mg/kg
- Sodium ion Na⁺
- 750 mg/kg
- Potassium ion K⁺
- 26.3 mg/kg
- Magnesium ion Mg²⁺
- 0.70 mg/kg
- Calcium ion Ca²⁺
- 339 mg/kg
- Aluminum ion Al³⁺
- 0.05 mg/kg
- Manganese ion Mn²⁺
- 0.06 mg/kg
- Iron(II) ion Fe²⁺
- 0.03 mg/kg
- Zinc ion Zn²⁺
- 0.01 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 2.4 mg/kg
- Barium ion Ba²⁺
- 0.06 mg/kg
- Copper ion Cu²⁺
- 0.02 mg/kg
- Total cations
- 1119 mg/kg
Anions
- Fluoride ion F⁻
- 1.0 mg/kg
- Chloride ion Cl⁻
- 1570 mg/kg
- Sulfate ion SO₄²⁻
- 347 mg/kg
- Bicarbonate ion HCO₃⁻
- 48.8 mg/kg
- Carbonate ion CO₃²⁻
- 6.0 mg/kg
- Nitrate ion NO₃⁻
- 0.60 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.00 mg/kg
- Total anions
- 1973 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 77.8 mg/kg
- Metaboric acid HBO₂
- 40.4 mg/kg
- Total undissociated
- 119 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.90 mg/kg
- Total dissolved gas
- 0.90 mg/kg
Totals
- Component total
- 3212 mg/kg
- Evaporation residue
- 3198 mg/kg
Usage
- Heating
- No
- Dilution
- No
- 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
