wiggydiggy
Guru
The difference is largely due to it being formulated for home use. The agricultural version was/is mixed down by the user to 200ml per 4 gallon knapsack sprayer. The home use version may contain 10ml for the same volume of water.
I did my own drive and neighbours, whilst she was on holiday having taken the dogs with her. Both still weed free five years later.
@Time Waster, you want the active ingredient from Agent Orange, try bleached coffee filter papers as suggested above. Many contain unsafe, sometimes leathal amounts of the active ingredient.
I might try this one then. I have the stones with the weeds growing on top of the membrane in whatever dirt has accumalated on top of it, will try to treat the entire areaI think.