I used to find bees dead in my bird baths until I got fountains for both of them. I bought the Bernini fountains from the Q, but since the battery compartments are not water tight and the batteries corrode and die so fast it's ridiculous, I went to a local hardware store and bought electric water pumps that are sold for small ponds, and use those instead. I just make sure the fountain pump speed is slow, so the water just trickles out of the four drain spouts into the bird bath, so the bees can crawl up to them and drink without risk of being washed into the water. The birds like the moving water, and the bees seem drawn to it as well. I suspect the water in your pool is moving, just because the volume is so large, and the water with the pebbles in it is not moving, so the bees still go to your pool. If you have a bird fountain, you could still put the pebbles in the bottom of it, and add a fountain, so the depth is never deep enough to drown bees, and maybe the moving water will draw the bees away from the pool? I have both my fountains plugged into an extension cord that plugs into a timer, so they only run during daylight hours and I don't have to be going out to turn them on and off twice a day, but I do flush and refill with fresh water every day anyway., after I've re-filled the bird and squirrel feeders. Hope this helps, @spumoni99 .