"Pat" wrote:

-snip-
Pardon my ignorance but why would I want to keep snakes away from my pond?

That is, if I had a pond... Mine is still in the planning stage... but I'm
really close to starting it. In the meantime I've been providing a small
pool just for tree frogs to breed...

That might be the primary reason. A snake or 2 is unavoidable, but
2 snakes can lead to 100s in a few months. That might threaten
your tree frog population.

Jim