Nurukawa Onsen
Analysis VerifiedGushing in the renowned Yufuin Onsen region, the Nurukawa Onsen source is beloved for its tranquil setting despite being conveniently located near Lake Kinrin. This spring is characterized by its soft, clear, and gentle water, a classic simple onsen cherished by many facilities in Yufuin. Its weakly alkaline nature is mild on the skin, leaving you feeling refreshed yet deeply warmed after bathing. It's the perfect spring for days when you want to gently unwind both mind and body amidst the idyllic scenery of Mount Yufu.
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.
Absorbed through the skin to gently promote peripheral circulation.
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 68.3°C, but it's adjusted to a comfortable temperature in the tubs. As a gentle, weakly alkaline simple spring, it's suitable for long soaks. Acclimate your body with "kake-yu" (scooped water) first, then immerse yourself slowly while taking in Yufuin's nature for deep relaxation.
The weakly alkaline water with a pH of 8.3 is expected to gently remove old skin cells, and it's rich in metasilicic acid (188.0 mg/kg), a natural moisturizing component. You'll likely notice silky skin after your bath. Its gentle quality is perfect for seeking deep relaxation or as a first step in balneotherapy to soothe daily fatigue.
The spring is gentle, but those with general contraindications for all hot springs (acute illness, severe heart disease, etc.) should refrain from bathing. Avoid prolonged soaking if you are not feeling well.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Nurukawa Onsen
- Spring type
- Simple Hot Spring
- Old spring type name
- 単純温泉
- Source temperature
- 68.3℃
- pH
- 8.3
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2021-07-01
- 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⁺
- 0.20 mg/kg
- Sodium ion Na⁺
- 158 mg/kg
- Potassium ion K⁺
- 14.1 mg/kg
- Magnesium ion Mg²⁺
- 3.4 mg/kg
- Calcium ion Ca²⁺
- 12.5 mg/kg
- Aluminum ion Al³⁺
- 0.20 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 0.10 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 0.19 mg/kg
Anions
- Fluoride ion F⁻
- 0.30 mg/kg
- Chloride ion Cl⁻
- 85.5 mg/kg
- Sulfate ion SO₄²⁻
- 78.8 mg/kg
- Bicarbonate ion HCO₃⁻
- 263 mg/kg
- Bromide ion Br⁻
- 0.20 mg/kg
- Total anions
- 0.43 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.10 mg/kg
- Metasilicic acid H₂SiO₃
- 188 mg/kg
- Metaboric acid HBO₂
- 4.7 mg/kg
- Total undissociated
- 0.19 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 41.4 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.04 mg/kg
Totals
- Total dissolved substances
- 0.81 mg/kg
- Component total
- 0.85 mg/kg
- Evaporation residue
- 0.63 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Autonomic instability, Insomnia, Depression
- General indications
- High blood pressure (mild), Rheumatoid arthritis, 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
