亀の井ホテル 有馬
(かめのいホテル ありま)
Uses natural hot spring water
348. Kamenoi Hotel, Arima Onsen Visited for higaeri (day use) for 800 yen (listed as 11:00 to 16:00). There were a lot of old guys when I visited. The photo of the bath is from the internet and matches reality. Inside there's one bath. The water is cloudy brown, temperature around 40. Breathing is tolerable. Quiet traditional Asian music was playing. Worth stopping by if you're passing through for higaeri, but I don't see a reason to go specifically.