pixi, it sounds like you are already well versed in snake maneuvers.
You can use the Snake Away after he leaves to keep anymore from showing up. One
thing I need to try and find out is if it would be a bad thing for any runoff
to get in the pond from the stuff.
Let us know what happens!
kathy :-)
algae primer
http://hometown.aol.com/ka30p/myhomepage/garden.html