I have a question and hope I get some good replies to it. In the past I have used all kinds of things for chumming catfish while rod and reeling from soured maze/milo and crushed corn, to dry dog food in coke bottles with holes drilled in it. I have even used range cubes for cattle and they work really good. But this weekend I heard one and I want to know if anyone else has heard of it, Has anyone heard of using mineral blocks for chumming? My brother-in-law was telling me that they use them on Lake Houston and I was wondering if anyone else has heard of them being used before ????? I could see how it would last for a while he said the large mineral blocks last all day.