(Kashō) Yurimachi Sodegaura Ekimae Mall Onsen
Analysis UnverifiedAwakened from deep beneath the earth on the shores of Tokyo Bay in Sodegaura, this onsen originates from ancient seawater. Its deep yellowish-brown color is a testament to the rich minerals nurtured by the land. The thermal effect of the hypertonic chloride spring envelops the body in a warmth that lingers long after bathing, gently melting away daily fatigue. This is a gift from the earth, perfect for those seeking deep tranquility and a day of complete mental and physical refreshment.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Above 10 mg classifies the spring as an "iodine spring" — a rare type that delivers antibacterial and anti-inflammatory action through the skin.
A "beauty spring" that gently emulsifies dead skin cells, leaving skin smooth after bathing.
Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").
Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.
A trace component with gentle antibacterial and anti-inflammatory action.
- Chloride (salt)5111 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 acid58.4 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.
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.
This hypertonic spring's components are easily absorbed, so avoid long soaks. We recommend 'split bathing'—repeating 10-minute soaks with breaks in between. A light rinse with a shower after your bath can help prevent feeling overwhelmed by the heat and minerals.
This hypertonic water, containing a remarkable 5,111 mg/kg of chloride ions, warms you to the core and provides exceptional restorative warmth. This superior heat retention is traditionally associated with easing muscle and joint tension, which may help relieve pain. Additionally, the abundant iodide ions (17.4 mg/kg) are known for their role in balancing the body's condition, guiding you toward deep relaxation.
Due to its high salt concentration and potent nature, those with sensitive skin or the elderly should avoid prolonged bathing and rinse with fresh water afterward.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- (Kashō) Yurimachi Sodegaura Ekimae Mall Onsen
- Spring type
- Iodine-containing Sodium Chloride Hot Spring
- Source temperature
- 25.5℃
- pH
- 7.7
- Flow rate
- 264 L/min
- Flow type
- Pumped
- Osmotic pressure
- Hypertonic
Analysis Document
- Analysis date
- 2019-09-07
- Analyst organization
- 株式会社東京水質研究所
- Registration No.
- 19東京都温泉分析第2号
Cations
- Hydrogen ion H⁺
- 0.00 mg/kg
- Sodium ion Na⁺
- 3559 mg/kg
- Potassium ion K⁺
- 91.7 mg/kg
- Magnesium ion Mg²⁺
- 61.2 mg/kg
- Calcium ion Ca²⁺
- 39.6 mg/kg
- Aluminum ion Al³⁺
- 0.10 mg/kg
- Manganese ion Mn²⁺
- 0.00 mg/kg
- Iron(II) ion Fe²⁺
- 0.00 mg/kg
- Iron(III) ion Fe³⁺
- 2.2 mg/kg
- Zinc ion Zn²⁺
- 0.01 mg/kg
- Lead ion Pb²⁺
- 0.01 mg/kg
- Copper ion Cu²⁺
- 0.01 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 3753 mg/kg
Anions
- Fluoride ion F⁻
- 0.40 mg/kg
- Chloride ion Cl⁻
- 5111 mg/kg
- Hydroxide ion OH⁻
- 0.00 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 0.20 mg/kg
- Bicarbonate ion HCO₃⁻
- 1358 mg/kg
- Carbonate ion CO₃²⁻
- 5.2 mg/kg
- Bromide ion Br⁻
- 9.1 mg/kg
- Iodide ion I⁻
- 17.4 mg/kg
- Hydrogen sulfate HSO₄⁻
- 0.00 mg/kg
- Arsenite ion AsO₂⁻
- 0.00 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Total anions
- 6501 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 58.4 mg/kg
- Metaboric acid HBO₂
- 10.0 mg/kg
- Total undissociated
- 68.3 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 45.4 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 45.4 mg/kg
Totals
- Total dissolved substances
- 10320 mg/kg
- Component total
- 10370 mg/kg
- Evaporation residue
- 9695 mg/kg
Usage
- Usage status
- Unknown
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), Consult a doctor if you have thyroid disease (iodine springs)
Drinking
- Drinkability
- Not drinkable
