Fuku-no-yu
Analysis UnverifiedNestled at the foot of the Northern Alps in Okuhida Onsen-go, 'Fuku no Yu' (Spring of Fortune) is a blessed hot spring said to bring good fortune to its visitors. With a gentle, skin-friendly neutral pH of 7.2, its abundant bicarbonate ions wash away old skin cells, leaving your skin smooth to the touch. As you immerse yourself in the water, you'll feel the hustle and bustle of daily life fade away, accompanied by a faint scent of sulfur. This calm and pure spring embraces all who wish to reset their mind and body and gain new vitality.
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.
- Bicarbonate (baking soda)
- Feel
- Your skin feels smooth and silky.
- Said to
- Said to remove old skin cells and excess sebum. Bathing indications include cuts, poor circulation and dry skin.
- Note
- It can leave skin dry—moisturize after bathing.
- Metasilicic acid133 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 temperature58.6℃
- 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.
The source is a high 58.6°C, but it's cooled to a comfortable temperature. It's best to take several short dips of 10-15 minutes rather than one long soak. Be sure to moisturize your skin after bathing to prevent dryness.
This sodium bicarbonate spring, with its skin-friendly neutral pH of 7.2, is said to provide a natural cleansing effect, leading to 'silky skin'. Furthermore, its high metasilicic acid content of 133.4 mg/kg may help maintain skin moisture, enhancing that hydrated feeling after your bath. It's the perfect onsen for a day when you want to soothe daily fatigue and refresh both mind and body.
While the spring is gentle, it's best to avoid or limit bathing time if you are not feeling well or have any skin cuts or inflammation.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Fuku-no-yu
- Spring type
- Sodium Bicarbonate Spring
- Old spring type name
- 重曹泉
- Source temperature
- 58.6℃
- pH
- 7.2
- Flow rate
- 68 L/min
- Flow type
- Pumped
- Osmotic pressure
- Hypotonic
Analysis Document
- Analysis date
- 2006-12-15
- Analyst organization
- (株)神岡衛生社
Cations
- Sodium ion Na⁺
- 174 mg/kg
- Potassium ion K⁺
- 19.3 mg/kg
- Magnesium ion Mg²⁺
- 3.5 mg/kg
- Calcium ion Ca²⁺
- 37.8 mg/kg
- Aluminum ion Al³⁺
- 0.20 mg/kg
- Iron(II) ion Fe²⁺
- 4.4 mg/kg
- Total cations
- 241 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 133 mg/kg
- Total undissociated
- 133 mg/kg
Totals
- Total dissolved substances
- 1028 mg/kg
- Component total
- 1072 mg/kg
- Evaporation residue
- 615 mg/kg
Usage
- Heating
- No
- Dilution
- No
- 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
