Ew! I have them terribley. It rained last night and there seems to be more. I have fished out at least twenty of them today and as you all have said you have to squash them or they just fly back in. The pool store guy said there is a chemical that you can put in the water that pushes them to the bottom of the pool and ultimately drowns them, but he himself did not seem to be sold on it. Has anyone else heard of anything to keep them from getting in the first place. They are so ugly! Thanks in advance for any help!