Pura Diffuser is designed to be used with Pura's proprietary fragrance cartridges, which are specifically formulated to work with the diffuser. However, Pura also offers a "Customize Your Scent" feature that allows you to blend two fragrances together to create your own unique scent using their fragrances. Mixing fragrances from other brands or using non-Pura cartridges may void the warranty and may not be compatible with the diffuser.