HCO is the sidecut stream from the main column that boils between the LCO and decanted oil (DO) product. HCO is often used as a pumparound stream to transfer heat to the fresh feed and/or to the debutanizer reboiler. If pulled as product, it is often processed in a hydrocracker or blended with the decanted oil. Decanted oil is the heaviest product from a cat cracker. It is also called slurry oil, clarified oil, and bottoms and FCC residue. Depending on the refinery location and market availability, DO is typically blended into No. 6 fuel, sold as a carbon black feedstock (CBFS) or even recycled to extinction.