Answer: I cannot absolutely address the pesticide drift into the pool water but I do know that most pesticides available to homeowners break down in the presence of sunlight and air. I also think that the minute amount that might drift into a pool would be diluted beyond its ability to even be detected in the water. What you might want to do is have the water tested if it is a real concern to you. As for what you can use near the pool that is effective against scale, aphids, mealybugs, etc. yet safe for humans and pets is the botanical Bacillus Thuringiensis (Bt) sold as Dipel and other brand names. You can also use Insecticidal Soap against these insect pests. Insecticidal soap is also safe to use near humans and pets and the residue does not persist.
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