Lava stone for finnish saunas

The replacement of the lava (or peridotic) stones of the Finnish sauna stove is done on average every 2 years.
The stones used are carefully selected to ensure that once positioned they allow optimal conservation of the heat that will be released in the sauna session.
An indicator of the fact that the peridotic stones are exhausted and must be replaced is the presence of crumbled parts inside the stove.
The correct positioning of the stones is fundamental for the durability and efficiency of the lava stone stove. The new stones must be inserted starting from the flatter ones that will be placed between the resistances, without forcing them. Then we will move on to the rounded ones, creating layers to repair the resistances, always without forcing them laterally or from above. The water that will be thrown on the stones, in fact, will not have to arrive directly on the resistances to avoid strong thermal shocks to the resistances.