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 For years I've never had issues but this year, I have a TON of mosquito larvae in my tub.  never really though about it until now, but what do others do to minimize the stagnant water woes ?  maybe I need to use it more often B)

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Good Morning,

A thin film of Oil, Cooking Oil, Vegetable Oil, Engine Oil, Hydraulic Oil, Special Oil (so Special, it doesn't have a name). They can't put their air pipe through the oil film, Finito!! You get the advantage of a oil film on your quenched parts, so they won't rust!!  Double your pleasure!!!

Neil

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You definitely want to kill off any mosquito larvae. There's been cases of Eastern equine encephalitis reported this summer. I think eleven cases have been reported with three fatalities in Mass. There's been cases of California encephalitis reported in Michigan.

Pnut

Edited by pnut

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Why do you have a quench tub?  In my smithing I just normalize stuff.  (As I work HC stuff often, having water around is a bad and evil thing luring you to ruin a piece you have just spent days working on!)

If I need water for spot cooling of mild steel, I fill a bucket with it and carry it out to the forge and when I'm done for the day I pour it onto the roots of the tree that shades the shop.

Back when the typical material forged was very low carbon wrought iron smiths commonly quenched at will; but that's long gone---A-36 sometimes can harden or crack when quenched.

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I keep a couple 1 gl. milk jugs of water in the shop in case. 

Mosquito control is very effective using garlic oil, a couple drops in a 1/2 wine barrel works a treat.

Frosty The Lucky. 

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I have a steel barrel that is maybe 10 gallons just outside the door to the shop placed so that it catches rain water off the roof.  To keep the mosquitoes out, I took an old bicycle wheel, removed the tire, stretched some window screen over the rim and put the tire back on to hold the screen in place.  That is the cover and it will still collect the run off from the roof but no critters.  Light and easy to move when needed.

I'm not sure, but I think if your slack tub is inside and out of the sun the mosquitoes may not find it attractive as a potential nursery.

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I put a little oil in mine, but for some reason that didn’t do the job (maybe not enough). Then my son added a splash of acid. No mosquitos now, but quenched items do rust faster. (Not sure I’d really recommend this method...)

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Mr. Goods,

Acids accelerate rusting. Acid is not needed to suppress mosquitoes. It probably does not do anything effective.

Putting a very thin layer of oil on top of the water should inhibit mosquitoes.

The oil clogs up the spiracles of the floating mosquito larvae. They float upside down with their butts up and they breath through their hind end. Oil clogs the spiracles and stops breathing. (respiration).

The oil layer need not be thick. Indeed a several molecule thick layer will work.

SLAG.

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