public baths were common in ancient roman times. it was a place to celebrate our love of water. by making water use into a communal event, we value it more than just hoarding it in private. public baths are still part of everyday life in japan. it has very interesting architectural possibilities as well. cascading fountains can be incorporated to add mood. the hot water can serve a double purpose when circulated through the building as radiant heat. the bath water is filtered similar to the way a swimming pool operates. there is no need to drain away the water except for periodic surface cleanings. soap does not get in the bath because the procedure is to soap and shower before you get in the bath. there is usually a designated children's area where the water is yellower.