Mountain of bugs

Vacuuming definitely gets them, but only temporary. I've been getting a pile of corpses like this from a mass suicide every few days all season. I didn't know if it's just the nature of the type of bug that they are sinking before making it to the skimmer? Do I have something set up wrong?
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.