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I use a backpack sprayer for all purposes, after using weed killer in it I just flush it through thoroughly, let it dry then use for what ever is next in line. No problems yet!
"Not all those who wander are lost"
I have to confess that I only used one watering can dedicated for weed killer use (it was a red plastic one which made it more distinctive than the other green ones) but think if it was thoroughly rinsed out, it might be okay (perhaps target a plant / weed to test it first to give yourself reassurance it is safe)
I still remember having an empty bottle of glyphosate and before throwing it away had rinsed it and then tipped the contents on a clump of (unwanted) grass ... it surprised me that the weed killer was still active despite the bottle being empty for many years. Hence, the caution about testing first.
I think the problem might be that although any water diluting the chemical might have evaporated traces of the active chemical might remain, which is why LL's suggestion of rinsing and testing on something that doesn't matter is a good one.
Dance caller. http://mo-dance-caller.blogspot.co.uk/p/what-i-do.html
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