Put the humidifier on a plate and moisten it with the propylene glycol solution (for sponge-based humidifier) or distilled water (for adorini deluxe premium humidifier based on acryl polymers). Leave the humidifier in the liquid for about 5 minutes. As soon as the humidifier has absorbed sufficient liquid, shake the humidifier so that liquid that was not absorbed will be removed. Now dry the humidifier with a cloth and place it in the humidor.
