This is one of the springs with the hard feeling water. It is pretty amazing to be honest and well worth the pricey entrance fee of ¥1000. They say some of the baths have Ginsen (銀泉 silver) and others have Kinsen (金線 gold) spring water but there was not much explaining the difference and the hot spring contents poster only listed one spring. (Maybe it is the filtered water vs. unfiltered?) The spring water here is king with people taking home liters upon liters of the stuff in large containers after soaking in it--and soaking in it is outstanding. The hot baths pale in comparison to the cold bath. That is the reason for coming here. Especially after getting out of the extra hot sauna. This is one place where I was not impressed by the steam sauna. It was nice but the combo of the dry sauna and the cold water bath was brilliant. There is also the best bubble bath I have experienced (stronger, bigger bubbles than usual) and a great view from the outdoor bath. Outstanding place and worth the trip.