Here is the deal. Doc Reams spoke of "hominy" as helping in cases of low potassium. However, there is a very strong probability he was referring only to hominy made in his day by the old-fashioned method of using the lye (potassium hydroxide) derived from soaking wood ashes in water. It is the same lye you make soap with.
What does the lye treatment do? It softens the husk and facilitates husk removal from corn soaked in it. This white hull-less corn is then either canned or dried and sold as hominy.