We recommend that the burner and wick assembly be replaced every 200 lightings or once per year. * To optimize the operation of the burner we also suggest that you clean it regularly (sometimes after repeated use it will turn black). Simply add SO NEUTRAL to your lampe and light the flame for 2 ? 5 minutes until the burner turns grey again. * Do not allow the flame to burn for more than 6 minutes . * Twenty minutes of burn time per 110 square feet is all you need to purify the air and leave it wonderfully fragranced * This item is not for sale in Catalina Island