I had a lot of trouble with squirrels eating my tomatoes during August. We had a very hot, dry month. It was really bad as they'd just take a couple of bites and leave them in the yard. They also got the watermelons right before they were ready to pick. I finally bought some peeled garlic and spread it around my garden. I also put a bowl with water in it as I'd read that they just want fluids. Not sure which worked, but I am now able to harvest my own tomatoes! So that worked to keep them away; no idea if it will work with your pool. Some people make pepper spray; there's a variety of things that work for different people. Apparently there's a couple of commercial products that you can purchase to keep them away, but they're expensive and not reliable.
Good luck,
Sue