Place the pad on the cloth inside the pot; continue to boil the water until all crystals are dissolved and the pad in completely clear.
When the pad is completely clear, (only liquid remains), take it out of the water using tongs, and place it on a cloth to cool down. Please notice: All crystals must dissolve, otherwise a chain reaction will begin and the pad will stay in its heated form. Carefully hold the pad against a light to make sure no crystals left. If crystals start forming while the pad is cooling, repeat steps 1, 2 and 3.
When the pad cools down, it is ready to be reused.