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Well, it's week 5 and all I can say is save your money and don't buy this. I put one treatment on with the hose end applicator as instructed on my front lawn first. 3 days later, I applied it to the back yards. The back yard is very well infested with the nut grass. After a week you could tell it did slow down the growth of the grass. Waited another week (per instructions) and applied the second application with a spot sprayer.
2 weeks after the second
The green in this picture is the nutgrass and crabgrass, the brown grass is my turf fescue that is now dead
Did I apply it as directed. Yes. Both times.
At best I would guess that this is diluted Round-up.