What can I use to snuff out mosquito larva within the drainage?

I use detergent with chlorine, is it ok? its a small drainage system at the pay for of our office but when i check ahead of time i can say hundred of thousand larva are at hand so I use detergent with lots of chlorine.. is in that any other alternatives? i also spray insecticide but it cannot reach underneath water right? any warning?


Answers:    Kerosene will do the trick. Just a small amount of kerosene from time to time. I grew up in a town call "Toowoomba" which is Aboriginal for "swamp" It had a fundamentally serious problem with mosquitoes at one time until a mayor call upon everyone to put kerosene in any nouns of their property that had stagnant marine. When I was growing up within the town there be no mosquitoes and as far as I know, there still aren't any because they be all eradicated beside this initiative
I would use the safest but strongest acid you can find, it should wipe them out.
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