Any apocalyptic way to kill nutgrass?

[AWSubie]

You’re right to be paranoid. I put in a 21 foot pool two years ago after the first year I had a couple sprigs of nutsedge coming through the bottom of the liner. I had to fill a 3cc syringe with glyphosate and inject into the liner to take care of it (which thankfully killed the sprigs) it seems like you have done about all that you can. good luck

 

[2LaneCruzer]

Methyl Bromide maybe?

https://www.ippc.int/static/media/f...0_2009_TPFQ_30___Weed_control_wi858924648.pdf

I used to work with an Engineer who was also a licensed pest control agent. I recall him talking about using Bromine to kill weeds/insects, but with many caveats.

 

[MossRoad]

This is how private people lose the right to purchase chemicals and dynamite. :laughing:

Dig out the soil to the recommended depth to remove the offending plant roots, fill in with sand, and compact it. I'd also go a couple feet past the diameter of the pool just to have a buffer. Sand makes a good base for pavers, brick, etc... around the outside of the pool as well. You should put some sand under the area anyway to help protect the liner from roots and rocks.

I'd be skeptical about putting salt in the soil under the pool, as salt will attack your metal frame if it gets to it. Salt leaches. Once you put the pool over that area, it will draw moisture UP to the bottom of the liner, and out to the sides. That's right where your metal pool frame will be.

I have a salt water above ground pool. Everything is fine until you get a leak. If it's not detected and stopped, in a year or two, you can see corrosion and rust on the metal walls and frame, especially in areas where the paint is scratched. The most troublesome areas are where the skimmer and water return line go through the wall.

 

[snymat68]

Dig out the soil to the recommended depth to remove the offending plant roots, fill in with sand, and compact it. I'd also go a couple feet past the diameter of the pool just to have a buffer.

I think this is the only way you're going to get piece of mind.

...or lay down a giant steel plate to put the pool on...

 

[strantor]

Methyl Bromide maybe?

https://www.ippc.int/static/media/f...0_2009_TPFQ_30___Weed_control_wi858924648.pdf

I used to work with an Engineer who was also a licensed pest control agent. I recall him talking about using Bromine to kill weeds/insects, but with many caveats.

I believe that's it. The document you linked describes the exact process that the old man did, so it must be it, or close enough. And, as I predicted, too effective to still be legal. Manufacture and importation banned since 2005, remaining quantity dwindled to where it's probably worth its weight in gold if you even know where to find it, have the proper licenses, and special permission slip granted by the government only for a verified agricultural emergency.

 

[strantor]

https://www.google.com/url?sa=t&sou...FjAAegQIAxAB&usg=AOvVaw2rRcaDNmQsrhINMnOQQAW8

Sounds like you want metolachlor

Thanks. I researched it a bit and found it odd that the manufacturer metolachor does not include nutsedge among the list of controlled species. But the 3rd party whitepaper you linked to says it does. Maybe it does, but just not well enough for the manufacturer to put their name behind it? I don't know. I was willing to give it a shot but couldn't find anywhere local to buy it, and didn't have time to wait for shipping. I had 6"-10" of rain on the way and had to decide whether to put the pool up and capture that rain, or let the rain pass and wait 2 weeks + for the mud hole to turn back into a pool site. The family compelled me against my better judgement. "Summer will be over by the time you get the pool finished "

 

[strantor]

it looks like you are describing Granular Chlorine, which would do as you describe..

I'm afraid I didn't see this in time. If it works that well, it would have been easy to spread it while I was spreading salt and insecticide. Oh well, thank you though.

 

[radios1]

I believe that's it. The document you linked describes the exact process that the old man did, so it must be it, or close enough. And, as I predicted, too effective to still be legal. Manufacture and importation banned since 2005, remaining quantity dwindled to where it's probably worth its weight in gold if you even know where to find it, have the proper licenses, and special permission slip granted by the government only for a verified agricultural emergency.

there's always Granular Chlorine, which you can still buy at a pool supply, and many other places.. if it's alive, Chlorine will kill it!.. it destroys DNA, but it's very safe, if common sense is used. it also dissipates in a couple of days in soil..

 

[strantor]

This is how private people lose the right to purchase chemicals and dynamite. :laughing:

Dig out the soil to the recommended depth to remove the offending plant roots, fill in with sand, and compact it. I'd also go a couple feet past the diameter of the pool just to have a buffer. Sand makes a good base for pavers, brick, etc... around the outside of the pool as well. You should put some sand under the area anyway to help protect the liner from roots and rocks.

I'd be skeptical about putting salt in the soil under the pool, as salt will attack your metal frame if it gets to it. Salt leaches. Once you put the pool over that area, it will draw moisture UP to the bottom of the liner, and out to the sides. That's right where your metal pool frame will be.

I have a salt water above ground pool. Everything is fine until you get a leak. If it's not detected and stopped, in a year or two, you can see corrosion and rust on the metal walls and frame, especially in areas where the paint is scratched. The most troublesome areas are where the skimmer and water return line go through the wall.

I also was skeptical about spreading salt under the pool and had the same concerns about it rusting out. The directions sent with the pool explicitly called for salt to spread under it, so if I do experience any rust problems stemming from the salt, it "should" be covered by the 25yr warranty. I also considered a sheet steel bottom but I've already spent more on this than I should have, and compounded by the weather time constraints, I pushed it from my mind. I might regret that.

 

[strantor]

So the pool is up. I layed 150lbs of salt and 50lbs of amdro, then a layer of road fabric, then 4-6" of compacted sand, then another layer of road fabric, then put in the liner. I was out there in my underwear laying the liner as the heavy rains were coming in. By the time I was done, I was flopping around in 2" of water.