A remedy that often works is to get some pool tile soap from a pool supply that sells to professionals. (You will have to buy a gallon unfortunately.) Put some in a squeeze bottle with a nozzle spout like a refillable ketchup dispenser or a hair color applicator bottle and shoot a stream of tile soap across the surface of the water wherever they are swimming. Tile soap will lower the surface tension enough to usually cause them to sink and drown so they can be removed with a leaf net. Tile soap will not cause your pool to foam and will have no lasting negative effects on your water quality.
I don't know of any way to get rid of them other than physically removing them.
All that said, borate is toxic to insects (and they are true insects) so adding 50 ppm borate to your water MIGHT be a more permanant solution (but I have not tried this particular use for adding borate but it seems like it might be a worthy experiment) and you will have all the usual borate benefits of better pH stability, algaestatic properties, more "sparkling" water (due to the change in light refraction ), etc.
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