This capillary additive is proprietary to Bell-A-Roma Candles. Just add fragrance oil to it and your oil becomes reed diffuser friendly. Our reed diffuser agent contains no alcohol and is considered odor free. It will work with most fragrance oils, very thick oils require less fragrance and more capillary agent. The additive should be used at 75% to 70%; more additive is used than fragrance oil. Thick fragrances such as most vanillas should only have 20% fragrance to 80% additive. You should test levels based on the strength of your fragrances and the viscosity of your oils. This is for 1 gallon or 128 ounces of diffuser capillary agent.