Kusunoyu
Analysis VerifiedThis private source, Kusunoyu, gushes forth in the Beppu Onsen area, one of the eight springs of Beppu. While its name is associated with the historic "Kusunoki Onsen" public bath dating back to the Kamakura period, that bathhouse is now closed. This source features a balanced blend of skin-smoothing bicarbonate ions and core-warming chloride ions at a gentle pH of 8.2. As you steep in its waters, the slightly viscous texture envelops your skin, leaving it feeling moisturized and restoratively warm long after you emerge. It is perfect for those seeking to unwind both body and soul in a historic spa town.
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.
Transdermal absorption gently supports skin hydration and muscle relaxation.
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 58.2°C, so facilities add water to cool it. The mild alkaline quality is gentle on the skin, but avoid long soaks and stay hydrated. For best results, let the mineral-rich water dry on your skin without rinsing.
With a pH of 8.2 and a high metasilicic acid content of 212.9 mg/kg, this spring is associated with silky skin, gently exfoliating and smoothing. Its chloride properties also provide restorative warmth that lingers after bathing. This is balneotherapy at its best, offering a chance to warm your core while refining your skin in historic Beppu.
Avoid bathing if you have an acute illness (especially with fever), severe heart disease, active tuberculosis, or malignant tumors. Note that this water is not for drinking.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Kusunoyu
- Spring type
- Sodium Bicarbonate and Chloride Spring
- Old spring type name
- 含食塩－重曹泉
- Source temperature
- 58.2℃
- pH
- 8.2
- Flow type
- 掘削自噴
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2012-12-11
- Analyst organization
- 公益社団法人大分県薬剤師会
- Registration No.
- 大分県第3号
Cations
- Lithium ion Li⁺
- 1.1 mg/kg
- Sodium ion Na⁺
- 176 mg/kg
- Potassium ion K⁺
- 18.3 mg/kg
- Magnesium ion Mg²⁺
- 20.6 mg/kg
- Calcium ion Ca²⁺
- 31.7 mg/kg
- Iron(II) ion Fe²⁺
- 0.10 mg/kg
- Strontium ion Sr²⁺
- 0.30 mg/kg
- Total cations
- 0.25 mg/kg
Anions
- Fluoride ion F⁻
- 0.50 mg/kg
- Chloride ion Cl⁻
- 122 mg/kg
- Sulfate ion SO₄²⁻
- 78.2 mg/kg
- Bicarbonate ion HCO₃⁻
- 395 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 0.40 mg/kg
- Nitrate ion NO₃⁻
- 0.70 mg/kg
- Total anions
- 597 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 0.20 mg/kg
- Metasilicic acid H₂SiO₃
- 198 mg/kg
- Metaboric acid HBO₂
- 5.8 mg/kg
- Total undissociated
- 0.20 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Trace Components
- Radon Rn
- 0 Bq/kg
Totals
- Total dissolved substances
- 1.0 mg/kg
- Component total
- 1.0 mg/kg
- Evaporation residue
- 0.81 mg/kg
Usage
- Heating
- No
- Dilution
- Yes（Water is added to cool the high-temperature source water to a suitable level for bathing.）
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, Depression, 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
