This next picture shows an overturn in progress:
This last picture shows a before and after a limnic eruption:
If my ponds turn over, I have not noticed. Sometimes there is a lot of aquatic plant remains floating on top, and of course there has been times when it gets partially covered with duck weed. OK, maybe I am the only one that never heard of limnic eruptions, but I did learn something in researching for this blog. Now, you all turn over and have a great day, you hear?