I applied it a few months ago and no sign of crabgrass yet

Expensive but very good.

It works but I would not call this "pro" use. It definitely works on crab grass. But it basically had very minor effect on preventing weeds and I used a double treatment on some lawns.

Works very well to keep crabgrass under control when applied at the correct time. I use gddtracker for timing in Michigan. The seller was gracious in getting the product to me in a timely fashion.

I live in Colorado in a semi-rural area on 2.5 acres. Each spring/summer we have "weed wars" across the town and valley. I use 2EW on my field grass and turf grass.... 2 applications per year, March and July, applied by hand with a hose-end sprayer. It doesn't eliminate the weeds entirely, but knocks them back by 98% or so. Much more effective and less costly than any post-emergent treatment. RECOMMENDED!