It is recommended that you change the pad every 2-3 weeks to ensure clean diffusion, or when selecting a new fragrance. In the top of each aroma lamp is a ceramic dish that holds water and a few drops of your favorite essential or fragrance oil. No need to worry about the dish drying out as it will not hurt the aroma lamp. Ours is on constantly and is used as a night light as well. These aromalamps and diffusers are perfect for aromatherapy professionals and massage therapists to use in their treatment rooms.
Colors are approximate.