ANA InterContinental Beppu Resort & Spa Tsuboyu Gensen
Analysis VerifiedThis ANA InterContinental Beppu Resort & Spa Tsuboyu Gensen source was developed using modern drilling techniques on a highland overlooking the historic, steam-filled streets of Kannawa, Beppu, a renowned therapeutic bathing area since the Kamakura period. A key feature is the dissolved salt, which gently envelops the skin to provide long-lasting warmth after bathing. It offers a moment of deep release for those seeking to connect with Beppu's magnificent nature.
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.
- Chloride (salt)609 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 acid242 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.
- Source temperature44.3℃
- Feel
- The source is 42°C or hotter; the bath may be on the hot side.
- Said to
- Heat is said to boost circulation and warm the body.
- Note
- Older people and those with high blood pressure or heart conditions should avoid baths of 42°C or more. Keep soaks short.
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.
Known as a "warming spring," this sodium-chloride onsen has excellent heat-retaining properties. To avoid overheating, it's best to exit the bath once your forehead begins to perspire. Rich in metasilicic acid, you can enhance its effects by not rinsing off after bathing, allowing the minerals to nourish your skin.
The primary chloride ions create a delicate veil on the skin, delivering a restorative warmth that lasts long after your bath. It's ideal for days when you feel chilled or notice poor circulation. Additionally, with a high content of 242.0 mg/kg of metasilicic acid—a known skin-beautifying component—you can expect to feel your skin become silky smooth. This spring is recommended as balneotherapy to soothe daily fatigue.
Due to its high salt content, individuals with high blood pressure, kidney disease, or heart conditions should avoid prolonged bathing. Those with sensitive skin should also be mindful of their bathing time to prevent irritation.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- ANA InterContinental Beppu Resort & Spa Tsuboyu Gensen
- Spring type
- Sodium Chloride Hot Spring
- Old spring type name
- 純食塩泉
- Source temperature
- 44.3℃
- pH
- 6.5
- Flow type
- 掘削
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2022-06-07
- 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⁺
- 1.7 mg/kg
- Sodium ion Na⁺
- 382 mg/kg
- Potassium ion K⁺
- 29.8 mg/kg
- Magnesium ion Mg²⁺
- 1.8 mg/kg
- Calcium ion Ca²⁺
- 17.5 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Strontium ion Sr²⁺
- 0.50 mg/kg
- Copper ion Cu²⁺
- < 0.05 mg/kg
- Cadmium ion Cd²⁺
- < 0.001 mg/kg
- Total cations
- 433 mg/kg
Anions
- Fluoride ion F⁻
- 0.40 mg/kg
- Chloride ion Cl⁻
- 609 mg/kg
- Sulfate ion SO₄²⁻
- 92.9 mg/kg
- Bicarbonate ion HCO₃⁻
- 62.2 mg/kg
- Bromide ion Br⁻
- 1.9 mg/kg
- Total anions
- 766 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.50 mg/kg
- Metasilicic acid H₂SiO₃
- 242 mg/kg
- Metaboric acid HBO₂
- 19.7 mg/kg
- Total undissociated
- 262 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 32.6 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 32.6 mg/kg
Trace Components
- Radon Rn
- < 7.4 Bq/kg
Totals
- Total dissolved substances
- 1462 mg/kg
- Component total
- 1495 mg/kg
- Evaporation residue
- 1385 mg/kg
Usage
- Heating
- Yes
- Dilution
- Yes
- Recycle / Filter
- Recycled
- Additives
- No
- Disinfection
- Yes
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)
Drinking
- Drinkability
- Not drinkable
