Applying algaecides and chlorine, monitoring pH balance, preventing algal build-ups, and skimming food sources and pool pests are ways to eliminate backswimmers from pools. The insects in question cannot live where regular anti-algae scrubs, insect removal, and pH checks are instituted.
They are called Backswimmers or Water Boatmen, believe it. In Jamaica, I've seen them bigger than the palm of your hand.
Freshwater ponds, lakes, and marshes. Sometimes found in pools of slow moving streams. However, they are often absent in habitats with fish.
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Salt water pools are in fact chlorine pools part of the salt is turned into chlorine by the salt water chlorinater If it works in a normally chlorinated pool it should also work in a salt water pool. However you should check if there is any metallic ingredient like copper in it as these are not recommended in salt water pools.
What are backswimmers adaptations
Gangs of Pond Skaters eat backswimmers although I dont know if they attack live creatures or just dispose of corpses.
other insects and fish
Water boatmen are sometimes confused with backswimmers, which are generally larger bugs that swim upside down and deliver a painful bite. from the web
it breathe through its stupidness
100 million years
north America, the USA
Under their wings is where backswimmers [Notonectidae family] store their air. They need it for the deep dives by which they escape many predators. But when they run out of air, they must be able to get back to the surface quickly.