I called a guy I know,
and he said that the reason they stress so much that you should be
sure to feed only the food grade and not the industrial grade, is that the
Industrial grade is much coarser ground. The food grade is finer. They said
that people will sometimes feed the I-grade because it is WAY cheaper, and that
is what makes horses sick, and colic. He said they never have had any reports of
problems with the food grade. But they have with feeding the I-grade. Just one
guys thoughts. Annie