Personally I use a separate dedicated sprayer that only touches glysophate because I'm too afraid.

 

I triple rinse glyphosate with plain water. No problems so far. Here’s some details.

https://agphd.com/wp-content/uploads/2022/02/Sprayer-Tank-Cleanout-Guide.pdf

 

I think doing a double rinse with clean water is more than enough. I know Tractor Supply sells a tank cleaner you can use if you are really worried. Even if there was residual left in the tank, if you fill it up with water it will be so diluted it won’t do anything anyway.

just imagine if you put just one ounce of Roundup in 4 gallons of water and sprayed weeds with it, do you think it would do anything?

 

Plain water is fine for flushing glyphosate, if you are really worried, they say you can use a little bleach too.

I have the M12 sprayer too and just use water to flush out my tanks. I rinse out the tanks then fill with clean water, flip the dial to high and then run the tank of clean water through, flushing out the hose and wand.

 

I usually rence, dump, rence and run clean through wand and call it good. Any small amounts of residual left in will not harm anything.

 

I'm to so much concerned about the tank (have a few on hand). Yeah, maybe overthinking it. I'll just run 1 or 2 tanks of water and whatever remnants in the hose/wand, should be fairly clean/diluted by then (hopefully). Like my OP said, last thing I want to spray some shrubs and next thing ya know......

The M12 is new. Hopefully it won't be a dud like my M18

 

Glyco is a growth regulator a little bit won't hurt. Ammonia can be used to clean your tank out. I think it is 1 cup for 100 gal. so you just need a little bit.

 

The solution to pollution is dilution. While what little chemical is on the tank surface (adsorbed) or absorbed into the plastic is so diluted when you fill the tank for the next use is measurable, it would not be enough to be an issue.

Even if you didn’t rinse the tank, you would be mixing an almost immeasurable amount of herbicide with a gallon or 2 of water.

 

Industry standard is triple rinse. It's a question on the lco and pco exams.

Most lco's have a dedicated gly sprayer, but that's usually to avoid unfortunate mistakes in the field.

 

Industry standard is triple rinse. It's a question on the lco and pco exams.

Most lco's have a dedicated gly sprayer, but that's usually to avoid unfortunate mistakes in the field.

This is what I remember reading. I have a dedicated glyphosate sprayer and still do this out of habit and remember to run clean water through the wand or the fist few passes could still have a concentrated amount of glyphosate in the hose and wand. Might be overkill but I have an easy safe place to do it so it isn't a hassle.

 

Like several others here, I have two backpack sprayers. I use a battery sprayer for selective herbicides, and a manual sprayer for glyphosate. Both of them get double rinsed, and a lot of clean water pumped through the wand and nozzle before storing. I also store them with some clean water in the tank. My feeling is that LDPE (polyethylene) will, over time, absorb a certain amount of whatever has been stored in them. Which explains why some are heavily stained with the residue of past chemicals. Yeah, it's a PITA but I've never regretted it.