You know I use to catfish all the time all over the place and I never did chum . I did however fish a lot around barge loading operations that loaded dog food and grain...it draws em in that's for sure. I have been thinking about trying chuming myself and I was thinking about just using commercial fish food in the sinking variety. And making me a dispenser or chum bag out of mesh wire about the right size. I keep thinking the foods with fish meal may be the best....maybe even cat food rather than dog food,course they make dog food now with fish but it's the expensive kind. I did chum one time for carp with a can of corn by tieing a string on it and punching holes in it with a screwdriver...I threw a few whole kernels in to....that worked good. It would probably work for catfish too....I use to catch cats on whole kernel corn once in awhile.