Here the link to the reservation system:
Rent the sauna
You can also rent the whole sauna for your group in Suolijärvi. You can e.g. do some sports together at Suolijärvi recreational area, then go to the sauna and dip to the lake (and possibly grill some sausages) and then continue the evening e.g. in the centre of Hervanta. The first three hours 148 € (15 sauna goers sauna), additional hours 25 €/h. Only the big public dressing rooms with showers are in use (lockers available). Note that the sauna is located on a public beach and the sauna-goers should obey the rules of the beach.
It is possible to rent the 15 sauna goers sauna for your group before or after the public sauna hours, 75 €/h. Ask more!
Social media of the sauna: