An iron-bearing simple cold-mineral spring (14.4 C at the wellhead), heated for bathing in the classic cold-mineral fashion. Iron(II) at 21.6 mg/kg oxidizes on air contact, painting the bath the characteristic rust-red of an akayu (red-water) source. Light overall mineralization at 269 mg/kg, but the iron carries the entire experience — water arrives clear at the spout and stains the tub reddish-brown.
Good for
Recovery
Warmth and buoyancy lower stress markers and improve sleep; habitual bathing is linked to lower rates of depression.
fatigue, stress
Take care
From a certificate analyzed in 1997.
This list uses the wording the Ministry of the Environment replaced in 2014, so it may not match a current certificate.
- Acute illness (especially when fever is present)
- Severe anemia
- Severe arteriosclerosis
- Any illness in an actively progressing stage
Full composition
The bar is each ion's share of charge (mval%) within its group; over 20% names the spring. Gases, silica and trace metals are measured by mass only.
- Iron (II)rusts brown in air; iron for anemia when drinkableFe²⁺21.6mgP96 national
- Calciumsettling and calming; can leave a white mineral bloomCa²⁺13.0mgP29 national
- Sodiumsalt's cation — pairs with chloride to make the water saltyNa⁺8.7mgP2 national
- Magnesiummild; a laxative if you drink itMg²⁺5.7mgP54 national
- Potassiumminor; matters for drinking limitsK⁺1.5mgP17 national
- Manganesetrace; companion to iron springsMn²⁺0.50mgP66 national
- Aluminumshows up in acidic volcanic waterAl³⁺0.30mgP67 national
- Sulfate"gypsum / Glauber's salt" — vessels and wound healingSO₄²⁻110mgP56 national
- Chloridetable-salt anion — coats the skin and holds heat inCl⁻18.0mgP16 national
- Iodideyellows in air; helps blood lipidsI⁻2.7mgP90 national
- Metasilicic acidmetasilicic acid — a natural moisturizer for silky skinH₂SiO₃45.4mgP25 national
- Free carbon dioxidefizz — widens blood vessels (strong above 1000 mg/kg)CO₂41.8mgP65 national
Measured at the source
On the certificate
From a certificate analyzed in 1997.
This list uses the wording the Ministry of the Environment replaced in 2014, so it may not match a current certificate. Items marked † were dropped from the official list then.
- Neuralgia
- Muscle pain
- Joint pain
- Chronic digestive disorders
- Hemorrhoids
- Menstrual disorders (dropped from the official list in 2014)