Beppu Onsen Hoyoland Roten Daiyokujo
Analysis UnverifiedThis source bubbles up straight through the floor of an open-air mud pool at Konya Jigoku in Myoban Onsen, filtering through layers of humic clay. Fine mineral mud steeps in the pH 2.6 water, and its heavier density lends a gentle, floating sensation. At a mild 39.9°C, bathers can linger while tiny bubbles rise around their feet, an unusual mud-bath experience for those who love lukewarm, slow soaks.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
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.
Though only 39.9°C, the pH 2.6 acidity and dense mud can irritate skin, so rest every 10 to 15 minutes. The floor is slippery; hold the handrails and rinse off the mud inside the pool before leaving.
With pH 2.6, 352 mg/kg of sulfate and 162 mg/kg of metasilicic acid, this lukewarm mud water suits unhurried balneotherapy. Acidic springs are traditionally associated with immune system stimulation, and the enveloping mud makes it a soothing choice for slow days.
The strong acidity and dense mud may irritate sensitive skin; children and those with delicate skin should keep soaks short and take care on the slippery floor.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Beppu Onsen Hoyoland Roten Daiyokujo
- Spring type
- Simple Acidic Spring
- Old spring type name
- 単純酸性泉
- Source temperature
- 39.9℃
- pH
- 2.6
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2016-04-20
- Analyst organization
- 公益社団法人大分県薬剤師会 検査センター
- Registration No.
- 大分県第3号
Cations
- Hydrogen ion H⁺
- 2.5 mg/kg
- Sodium ion Na⁺
- 24.8 mg/kg
- Potassium ion K⁺
- 8.9 mg/kg
- Ammonium ion NH₄⁺
- 0.30 mg/kg
- Magnesium ion Mg²⁺
- 5.7 mg/kg
- Calcium ion Ca²⁺
- 27.7 mg/kg
- Aluminum ion Al³⁺
- 13.7 mg/kg
- Manganese ion Mn²⁺
- 0.30 mg/kg
- Iron(II) ion Fe²⁺
- 5.8 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Strontium ion Sr²⁺
- 0.10 mg/kg
- Copper ion Cu²⁺
- < 0.05 mg/kg
- Cadmium ion Cd²⁺
- < 0.001 mg/kg
- Total cations
- 0.09 mg/kg
Anions
- Fluoride ion F⁻
- < 0.1 mg/kg
- Chloride ion Cl⁻
- 9.1 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.30 mg/kg
- Sulfate ion SO₄²⁻
- 352 mg/kg
- Hydrogen sulfate HSO₄⁻
- 29.8 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 1.7 mg/kg
- Total anions
- 0.39 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.20 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.00 mg/kg
- Metasilicic acid H₂SiO₃
- 162 mg/kg
- Metaboric acid HBO₂
- 0.00 mg/kg
- Total undissociated
- 0.16 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 19.8 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.02 mg/kg
Trace Components
- Radon Rn
- < 7.4 Bq/kg
Totals
- Total dissolved substances
- 0.64 mg/kg
- Component total
- 0.66 mg/kg
- Evaporation residue
- 0.82 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, Epidermal suppuration, Impaired glucose tolerance (diabetes)
- 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), Sensitive skin or mucous membranes, eye conditions (acidic springs)
Drinking
- Drinkability
- Not drinkable
