含鉄泉

At least 20 mg/kg of total iron. Colourless at the source, it oxidises on contact with air and turns rust-brown — the water called 赤湯 ("red bath"). Where drinking is permitted it is used for iron-deficiency anaemia.

What it is like

Cloudy rust-red to brown. Tastes and smells distinctly of iron, like blood or old pipework. Leaves red deposits on the bath rim.

Indications (適応症)

Where drinking is permitted: iron-deficiency anaemia

Contraindications (禁忌症)

It will stain a white towel or swimsuit, permanently. Drinking is only meaningful at the source, before oxidation.

適応症 and 禁忌症 are the claims a certificate is permitted to state under the Hot Spring Act. They are not medical advice, and nothing here is. If you have a heart condition, are pregnant, or are unwell, ask a doctor rather than a guidebook.