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Refs: |
* https://www.experienceniseko.com/news/immerse-yourself-what-are-onsen: "to qualify as a gensen kake-nagashi onsen … direct and continuous inflow of the onsen from the ground source must be present; overflowed water cannot be reused; and no water can be added to control the temperature or quantity of the onsen."
* https://www.japan-guide.com/e/e2292_water.html: "Gensen kakenagashi" refers to hot spring water that directly flows from the source into the bath tub generally without treatment or reuse.
* https://prtimes.jp/main/html/rd/p/000000409.000007099.html
* https://onsen.community2.fmworld.net/articles/1040/
源泉かけ流し 192,493 58.1%
源泉掛け流し 138,685 41.9% |