noun
free-flowing hot spring water from the source
Refers to onsen where fresh, untreated hot spring water flows directly into the bath without recirculation, filtration, or additives. A key quality marker for hot spring enthusiasts.
この旅館は源泉かけ流しの温泉が自慢です。
This inn prides itself on its free-flowing hot spring water from the source.
源泉かけ流しの湯
The water from a free-flowing source is gentle on the skin.