this post was submitted on 19 Jun 2023
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I have been in the pool (build-in pool at ground level) the last few days and I noticed that there are a lot of dead flying insects in there. Or insects that are about to drown. I rarely swim in natural water and when I do, it usually is not that clear to see if it happens there as well. So are threy drowning in natural water as wel? It's not that the sides of the pool are to slippery or steep to get out, they sometimes just land in the water and can't fly back out. Do they drown in natural water? And if not, why do they die in poolwater?

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[–] [email protected] 5 points 1 year ago (1 children)

Do they drown in natural water? And if not, why do they die in poolwater?

I can answer the 2nd part of the question. Man-made pools have chemicals (chlorine being the main one) introduced to them as a means of stopping or slowing plants and fungus growing in them. These chemicals aren't just harmful to plants and fungus, but to all life. We (and larger animals) are OK because there are just enough chemicals to stop plant and fungus growth, but if we drank the pool water we would get very sick. Insects, being as small as they are, are affected by these chemicals and die quickly if they do not leave the pool in time.

I do not know if these chemicals also somehow alter the surface tension of the water and therefore makes it harder for insects to leave, or makes it easier for them to get stuck in it. Hopefully someone with more knowledge can chime in.

[–] [email protected] 1 points 1 year ago

Thanks. I thought it had something todo with the chemicals. But I still wonder why they get in the water in the first place. But maybe it's just not as obvious in natural water.

[–] [email protected] 0 points 1 year ago (1 children)

I don't know for sure, but some thoughts on the matter. If the pool has lights in it, they are attracted to the lights. Also they will land to drink and swimming pools unlike puddles or ponds, usually have steep sides without rocks, overhanging branches, shallow ends etc for them to land on, so they fall in and then can't get out. Also insects in larger bodies of water that do fall in would get eaten by fish.

[–] [email protected] -1 points 1 year ago

I would also guess that pumps play some part to it. While they aren't that strong, you don't really need to be strong to win over a fly.