A package of 23 kg of high-quality base stone.
The stones are made of lava stone, which has the task of distributing heat from the heaters. The base stones should be placed between the heaters, the largest stones should be placed in the bottom and smaller stones at the top. Avoid putting the stones too tightly as it prevents the air from circulating through the oven and can also damage the heaters. Make sure the stones cover the entire heater.
To ensure that the base stones do not crack, you should repackage the stones at least once a year. Make sure that there is air between the stones so that the air circulation works well.