I hit a wide mix of persistent weeds with regular old round up from homedepot and most of them were brown within 24 hours. The ones that lived, or dodged the bullet the first time around got a heavy soaking of to instruction strength ProMax a few days later. Nothing Gave them a second coat, this time double strength. 72 hours later and most green is still green but a little shriveled. I was expecting to hear the weeds begging for their lives, so my experience was less than impressive compared to regular old round up.
I have used this product for many years but I think in light of the lawsuits they
have changed the formulation. It takes much longer to kill the weeds specially the broad leave weeds. It does not kill some of the weeds even though I used 6 oz. per gallon of water. It is not worth the price buy the generic version for $30 less.