Wash the sauna stones before laying them in the heaterRinse the sauna stones with water before placing them inside the heater. This removes dust from the rocks and provides you with more wholesome steam.It is advisable to temper the sauna stones before the first sauna sessionTempering the sauna stones before their first use is recommended to increase their durability. In order to do it, heat them once to the usual sauna temperature, and let them cool down slowly without throwing water on them.And done!  Sauna stones are ready for subsequent sauna sessions!