If you visit a Japanese Onsen you can also experience insen...............
http://www.tourism-review.com/travel-tourism-magazine-onsen-therapy-in-japan-is-popular-among-the-elderly-article1453..........with minerals such as chloride and chlorite as part of the total experience. It made me feel better recently.
'The onsen's chemical makeup is one of the key elements of balneotherapy. According to the 1979 revision of the 1948 Onsen Law, nine types of onsen water are recognized as having proven medical benefits. These are nisankatanso-sen (spring water high in carbon dioxide), tansansuisoen-sen (hydrogen carbonate),
enkabutsu-sen (chloride), ryusan-sen (sulfate), tetsu-sen (iron), io-sen (sulfur), sansei-sen (acidic), hoshano-sen (radioactive) and tanjun (spring water that lacks these attributes but has a temperature of over 24 degrees).'