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Old 06-17-2011, 08:25 AM
alanauer alanauer is offline
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Cleaning Glyphosate Sprayer

I know glyphosate becomes inert on contact with the ground, but I don't know the mechanism. So I wondered if there's some way to de-activate it in a sprayer other than just rinsing the internals with water a few times.
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Old 06-17-2011, 05:19 PM
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Think Green Think Green is offline
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Glyphosate is a amino acid inhibitor and is not active on soil particles.


Risate is a good place to start. (Nutra-Sol) or (Inside out) is a couple products that aren't too expensive. The label should give you a solution, however, a cup of Ammonia to a gallon of water repeated a couple times fill flush out the sprayer. On the second attempt add some dish soap to the water-shake--spray out the nozzles and line with pressure. Rinse out the sprayer one last time.
Glyphosate will become extra diluted with more water.................depending on the % you mixed and how long it stayed in the container before cleaning. Viton seals that come in roundup ready sprayers are pretty good at not holding residues..........so flush the sprayer out a few times and go.

The question I have for you is this---" What do you plan on using the sprayer for after this?" I wouldn't suggest using it for anything but glyphosate.....to be safe.

This is the reason why I own 5 backpack sprayers........one for each situation and chemical combination I use. Don't really have the time to sit around flushing out sprayers on the week ends. The skid gets cleaned out regularly though.
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Old 06-17-2011, 10:59 PM
alanauer alanauer is offline
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I appreciate your comments. What are Risate/Nutra-Sol/InsideOut? (Ammonia, bleach, soap, I can certainly do.)

To answer your questions, I make my glyphosate a smidge stronger than label, add some surfactant, and leave it in the spray system for up to a week. (Does this makes it harder to get rid of?) I spray the ground (mostly broadleaf killer) and trees (dormant/lime-sulphur and anti-fungals).

Assuming lots of water were used, would not extremely diluted glyphosate be harmless to leaves?
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Old 06-17-2011, 11:56 PM
Will P.C. Will P.C. is offline
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I used to own 1 Stihl sprayer. I would always rinse it out very well. Ammonia, soap, multiple flushing of the wand, and finally filling ip up halfway with water and spraying all the water out. I would always dry it out as well to prevent the grommets from rotting. It was probably a 15-20 minute ordeal.

Last season I killed 2 of my 18 roses while spraying a fugicide. It wasn't a potent kill, but I guess the sprayer had enough residue in it somewhere to kill it very slowly. I was able to nurse back another 2 roses and the rest were fine. The 2 that I have nursed back still aren't 100%. 1 is about 85% and the other 50%. Since the rest of the roses were fine, I assume the residual stuff was somewhere in the wand.

You need to buy another sprayer and label each spray boldly. I cannot imagine a professional having the time to do a proper rinse each spray. Furthermore, it is near impossible to get all the glyco out.
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Old 06-18-2011, 09:32 AM
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RigglePLC RigglePLC is offline
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Roundup or glyphosate is a problem. 2,4-D is notoriously difficult to remove completely. Just think of the risks of spraying a fungicide on tomatoes with a backpack formerly used for a three-way. Experienced people will never do it, (again.)

Back packs have an additional problem. Most have a one-pint air reserve chamber which keeps the spray going during slight pauses and the pump handle upstroke. This chamber can become filled with water (and herbicide solution). Turning the tank upside down does not empty the reserve chamber.
If you intend to use the same sprayer--you should clean it out--then test it on some sensitive plants like tomatoes, grape vines, or box elder trees. Allow 48 hours.

Sometimes hand sprayers have a similar problem. Spray solution can work its way into the barrel of the pump...leaving a reservoir of said solution that will not drain. Since the pump is not normally wet inside--the residue is difficult to remove unless the pump is fully disassembled.
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Old 06-18-2011, 02:26 PM
alanauer alanauer is offline
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Appreciate all the responses. Meanwhile, I did some web searching, and found the following from what appear to be reputable sources.

The reason glyphosate becomes inert once on the ground is from bacterial action. That's why there is no "defuser" you can add to it for deactivation, and why if you apply it over mulch it will not automatically degrade.

Common herbicides that are much longer-lasting in sprayers, especially after sitting for a day, are those with 2,4-D and dicamba. You can get some of it out with water, commercial tank cleaners, household ammonia left overnight, detergents, the cleaner trisodium phosphate OR (better sit down) glyphosate itself. (About ammonia, you want a 1% solution of 3% ammonia, and keep it away from chlorine/bleach unless your insurance is current.)

About killing roses from a contaminated sprayer, if I did that in the boss's rose garden, she'd cut off my wand, so thanks for the warning. Are you sure you didn't once have 2,4-D and/or dicamba in the sprayer?
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Old 06-18-2011, 03:40 PM
greendoctor greendoctor is offline
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Lorena Bobbit part deux. Sprayer are cheap, reattachment surgery isn't. I keep separate sprayers for herbicides and shrub applications as well. I use lots of sulfonylurea herbicides. Those are notoriously difficult to wash out properly and they are lethal in microgram amounts.

Do a search on member Whitey. He had to replace several thousand sq ft of lawn because glyphosate trapped in his backpack sprayer mingled with a lawn herbicide mix.
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Old 06-18-2011, 03:54 PM
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Florida Gardener Florida Gardener is offline
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Yea, I have one backpack that SOLELY sees gly and that is it. Def don't want to be replacing plants.
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Old 06-18-2011, 07:43 PM
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phasthound phasthound is offline
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Quote:
Originally Posted by greendoctor View Post
Lorena Bobbit part deux. Sprayer are cheap, reattachment surgery isn't.
Ouch! Oh God just thinking about that hurts!!
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Old 06-18-2011, 07:55 PM
greendoctor greendoctor is offline
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Originally Posted by diamondlandscaping View Post
Yea, I have one backpack that SOLELY sees gly and that is it. Def don't want to be replacing plants.
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I have two separate B & G hand cans for the same reason. One is used for Sureguard, Reward, RoundUp, the other is only for selective over the top herbicides in ornamentals. Traces of Sureguard will burn up mondo really bad.
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