Sentō and supersentō in Kansai that do have access to a hot spring well often differentiate themselves by having "natural hot spring" (天然温泉) somewhere on their signage.
The curtain is usually blue and shows the kanji 湯 (yu, lit. After the entrance there is an area with shoe lockers, followed by two long curtains or door, one on each side.
These lead to the datsuijo (脱衣場, changing room), also known as datsuiba for the men and women respectively.
is a type of Japanese communal bath house where customers pay for entrance.
Traditionally these bath houses have been quite utilitarian, with a tall barrier separating the sexes within one large room, a minimum of lined up faucets on both sides and a single large bath for the already washed bathers to sit in among others.
The separating wall between the men and the women side is also about 1.5 m high.
The ceiling may be 4 m high, with large windows in the top.
There is usually a refreshment cooler here where customers can self-serve and pay the attendant.
Milk drinks are traditional favorites and sometimes there is ice cream.
Similarly, in old sentō the height scale may go only to 180 cm. The women's side usually has some baby beds, and may have more mirrors.