Poppo-an
Analysis VerifiedThe Poppo-an source is a private wellspring drilled in the tranquil countryside of Yufuin, one of Japan's premier onsen destinations. Located amidst serene landscapes with views of Mt. Yufu, its name is said to derive from the beloved local train that runs nearby. This alkaline simple spring is characterized by its gentle, non-irritating waters that seem to smoothly envelop the skin. After bathing, your skin will feel deeply moisturized, filling both mind and body with profound relaxation.
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.
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.
With a gentle pH of 8.6, this alkaline simple spring is suitable for longer soaks. Rich in metasilicic acid, it offers moisturizing benefits. To maximize its effects, gently pat your skin dry with a towel after bathing, rather than rinsing off, to allow the beneficial minerals to remain on your skin.
With a weakly alkaline pH of 8.6 and a high metasilicic acid content of 166 mg/kg, this onsen is perfect for those seeking silky skin. It is known to gently exfoliate and deeply moisturize. As a non-irritating simple spring, it also promotes deep relaxation, making it ideal for unwinding and rejuvenating both skin and spirit.
Please avoid bathing if you have general contraindications for hot springs, such as acute illness, severe heart disease, or malignant tumors. The water is not for drinking.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Poppo-an
- Spring type
- Alkaline Simple Hot Spring
- Old spring type name
- 単純温泉
- Source temperature
- 69.2℃
- pH
- 8.6
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2024-05-08
- 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⁺
- 0.30 mg/kg
- Sodium ion Na⁺
- 160 mg/kg
- Potassium ion K⁺
- 11.0 mg/kg
- Magnesium ion Mg²⁺
- 2.5 mg/kg
- Calcium ion Ca²⁺
- 12.2 mg/kg
- Strontium ion Sr²⁺
- 0.10 mg/kg
- Total cations
- 0.19 mg/kg
Anions
- Fluoride ion F⁻
- 0.30 mg/kg
- Chloride ion Cl⁻
- 115 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.10 mg/kg
- Sulfate ion SO₄²⁻
- 42.7 mg/kg
- Bicarbonate ion HCO₃⁻
- 216 mg/kg
- Carbonate ion CO₃²⁻
- 15.6 mg/kg
- Bromide ion Br⁻
- 0.30 mg/kg
- Total anions
- 0.39 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.20 mg/kg
- Metasilicic acid H₂SiO₃
- 166 mg/kg
- Metaboric acid HBO₂
- 5.4 mg/kg
- Total undissociated
- 0.17 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
Totals
- Total dissolved substances
- 0.75 mg/kg
- Component total
- 0.75 mg/kg
- Evaporation residue
- 0.61 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
