Same issue here with them.
They are attracted by my vegetable garden, and end up in skimmer, usually 15 of them everyday which are stuck to the scum bug trying to save themselves eventually turning tan color.
They also like flowering crab apple trees.
One year I thought I would really make a difference and eliminate them.
I bought 4 traps and hung them around parameter of back lawn.
What a mistake, not only gets costly fast, but I had to dump ea. one every day, totally full and smelled horrid.
Now I just wave the white surrender flag and treat my leafy vegetable plants as they can destroy them. "Bayer" does make a tree and shrub early spring treatment liquid that you mix and pour around a tree that gets infested by them every year.
It works good but one bottle is $17.00 and treats about 3 trees depending on size of trunk. I use it on my Crab Apple and has really helped. If you have trees, check the leaves, maybe that's what's bringing them closer to pool.