Just to add to what CC has said, I am on the other side of Michigan and have a pond which is 100% clay. This has been the worst year in the seven we have had the pond for water levels. We would drop maybe 12-18 inches, but this year we were down nearly 36 inches during our hot July and are still down 24 inches. During these really hot days like we had in July I think the clay wickes water to the surrounding areas, sharing the water. Point in fact our grass never turned yellow or brown, and needed to be cut weekly even though we were so dry. The Muck tablets may have had some effect, but Morty is in Ohio and most likely had the same weather patterns as we did. Just my 2 cents worth.
