Kill them with a boogie board!
They come for the water, so as soon as you uncover your pool they show up.
In my experience, tehre's usually just 3-5 that show up, wait for them to land, THEN swat them with a large object, tehy're relatively slow in comparison to other flies so you can usually get them the first time, swat one usually stuns long enough to get swat 2 (the killer) in.
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