Our custom formulated reed diffuser oil base has been designed to work with most fragrance and essential oils to give off maximum scent with your reeds. Unlike Dipropylene Glycol, which is heavier than water, our diffuser base is a low viscosity product that is lighter than water. Simply blend your favorite fragrance or essential oil with diffuser base, insert the reeds, and wait for the fragrance to permeate the room. Normal mix ratios are between 20% to 40% fragrance oil and 60% to 80% reed diffuser base.