Sukayu Onsen (Netto)
Analysis UnverifiedThis spring rises at a spa retreat about 900 m up the northwest flank of the Hakkoda Mountains, amid beech forest, in the area chosen as Japan's first National Health Resort Hot Spring. It has long filled a great bathhouse built entirely of hiba cypress alongside the area's other springs. At pH 1.71 it is strongly acidic, with a tingling bite on the skin and a faint scent of sulfur and iron; sinking into its milky water feels like the essence of a traditional healing spa, especially in deep-snow winter.
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.
An iron-rich spring whose water turns yellow-brown to red-brown when exposed to air. Strong heat retention.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
Oxidized iron. Tints the water reddish-brown, lending a visually dramatic, "powerful" bath feel.
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.
Being strongly acidic, start with short soaks; if your skin tingles afterward, rinse lightly with fresh water, and take care not to get the water in your eyes.
Strongly acidic with 13.3 mg/kg of hydrogen ions and carrying 3.2 mg/kg of free hydrogen sulfide, this spring is traditionally associated with immune system stimulation and has long been used for balneotherapy.
Because of the strong acidity, those with sensitive or dry skin should avoid long soaks and rinse with fresh water afterward.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Sukayu Onsen (Netto)
- Spring type
- Acidic Sulfur-containing Iron (II,III) Aluminum Sulfate and Chloride Spring (hydrogen sulfide type)
- Source temperature
- 48.8℃
- pH
- 1.71
Analysis Document
- Analysis date
- 2022-07-19
- Analyst organization
- 一般財団法人 青森県薬剤師会 食と水の検査センター
- Registration No.
- 青森県第2号
Cations
- Hydrogen ion H⁺
- 13.3 mg/kg
- Lithium ion Li⁺
- 0.00 mg/kg
- Sodium ion Na⁺
- 56.1 mg/kg
- Potassium ion K⁺
- 19.2 mg/kg
- Ammonium ion NH₄⁺
- 1.0 mg/kg
- Magnesium ion Mg²⁺
- 62.5 mg/kg
- Calcium ion Ca²⁺
- 201 mg/kg
- Aluminum ion Al³⁺
- 212 mg/kg
- Manganese ion Mn²⁺
- 2.3 mg/kg
- Iron(II) ion Fe²⁺
- 53.1 mg/kg
- Iron(III) ion Fe³⁺
- 26.7 mg/kg
- Zinc ion Zn²⁺
- 0.20 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Copper ion Cu²⁺
- < 0.01 mg/kg
- Cadmium ion Cd²⁺
- < 0.005 mg/kg
- Total cations
- 0.65 mg/kg
Anions
- Fluoride ion F⁻
- 0.80 mg/kg
- Chloride ion Cl⁻
- 480 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 1.8 mg/kg
- Sulfate ion SO₄²⁻
- 1716 mg/kg
- Bicarbonate ion HCO₃⁻
- 0.00 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 0.00 mg/kg
- Iodide ion I⁻
- 0.00 mg/kg
- Hydrogen sulfate HSO₄⁻
- 762 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Total anions
- 3.0 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 25.3 mg/kg
- Arsenious acid HAsO₂
- 2.0 mg/kg
- Metasilicic acid H₂SiO₃
- 264 mg/kg
- Metaboric acid HBO₂
- 4.2 mg/kg
- Total undissociated
- 0.30 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 145 mg/kg
- Free hydrogen sulfide H₂S
- 3.2 mg/kg
- Total dissolved gas
- 0.15 mg/kg
Totals
- Total dissolved substances
- 3.9 mg/kg
- Component total
- 4.1 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Atopic dermatitis, Plaque psoriasis, Epidermal suppuration, Impaired glucose tolerance (diabetes), Chronic eczema, 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), Sensitive skin or mucous membranes, eye conditions (acidic springs), Severe chronic dermatitis (sulphur springs)
Drinking
- Drinkability
- Not drinkable
