Aufguss Ritual – Finlandia Sauna Aufguss Ritual – Finlandia Sauna Have you heard about the Aufguss ritual? Aufguss is German for Infusion. Based on an ancient Finnish practice, this ritual heightens the effects of the traditional vaporization technique by using water enriched with natural essential oils. So when the water is poured onto the heated stones, a burst of vapour with health enhancing properties is released.Nordik Spa-Nature, always searching for the best in heat therapy techniques, is pleased to offer you Aufguss in its Finlandia sauna. Every day, once every two hours.