I would expect at least one of these in a spa,or even just a Sauna and defenitely decent washing facilities. Jacuzzis are a bit of a pain, so much cleaning and always the risk of contamination. Same with steam rooms, they can smell really fiesty if not kept really clean. It seems like a lot of work for probably very little income. Your other treatments will have to carry the cost of the maintenance and care of these.Also the costs of running them, heating the water etc. I believe a sauna will probably be the easiest to look after and they are not that expensive to buy