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Author: Subject: water additive to stop mosquitoes
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[*] posted on 18-8-2019 at 16:19
water additive to stop mosquitoes

I have a pest problem, and while I can think of several chemical solutions, none of them meet all my criteria.

I have a sink converted to a recirculating aspirator, and so there are 3-5 gallons of standing water when not in use. I put 1/4 tsp of bleach in it before but that caused some foaming. I want it to
- kill the mosquito larvae while in the sink aspirator,
- react minimally with anything I'm distilling under vacuum,
- not be a hazard to the other wildlife when I want to drain some water,
- not encourage the ice to melt or lower the freezing temp of the water, and
- not evaporate appreciably below 80ºC.

Google suggests dish soap or shampoo, both VERY foamy. I can live with a little bit of inefficient bubbles, but thought there might be a simple solution I'm overlooking. Anything else come to mind? Maybe I should just run it shortly for twice a week - surely they can't last in the turbulence of a 3/4 HP pump.
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[*] posted on 18-8-2019 at 16:50

I think that adding some methanol to the water kills the larvae,
or you could use a u.v. lamp to prevent algae which I believe is their food source.

The easiest and most environmentally responsible method would be to ensure that mosquitos cannot get to the water !
Cover the tank with a lid or netting.

CAUTION : Hobby Chemist, not Professional or even Amateur
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[*] posted on 18-8-2019 at 18:03

Maybe a tiny bit of copper sulfate?

It shouldn’t take much at all, less than a ppm.

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[*] posted on 18-8-2019 at 20:17

I use Mosquito Dunks in my backyard pond. They are a bacteria toxic to mosquito larvae. They do leave some particulates though when they dissolve.

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draculic acid69
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[*] posted on 19-8-2019 at 00:32

Is borax any good for this?
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[*] posted on 19-8-2019 at 06:42
3 DIY Mosquito Trap Comparison
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[*] posted on 21-8-2019 at 20:43

I'll second the mosquito dunk recommendation, takes care of gnats too iirc.
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[*] posted on 22-8-2019 at 10:29

Enough washing soda or rust remover to push the pH too high or too low for the larvae.
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