The pure air- so neutral fragrance refill is absolutely essential. In addition to purifying the air in your interior without diffusing a scent, it also allows you to adjust the intensity of your fragrance by diluting it. Lastly, the pure air- so neutral fragrance refill will be essential for your Maison Berger Paris fragrance diffuser to work properly, as it will allow you to clean the burner between each fragrance. Made in France. Perfume without dye guaranteed. 1L.