It is recommended to change to a new atomizer after every 2 bottles or at least when you feel that atomizer gives an off-smell. Life of an atomizer is seriously impacted by the amount of dust in the environment as well as the duration of puff and speed of inhalation.
With LIQUA 4S e-Liquid we did our best to ensure the balance between potential leakage and atomizer life as well as ensured full compatibility of flavor recipe with device materials.