The ants will bring this sweet-tasting poison back to their colony and after a few days, BAM! This kills both the workers and the queen.
Promising review: "Outstanding product. Unusually warm weather out this way for Feb and we were finding relatively large ants in our kitchen. Went online, saw the reviews for Terro and it sure and heck beat out anything by Raid or its ilk, ordered some, laid them down in the kitchen, within two days the ants were gone. Found a few of them inside the traps, but then on the whole didn't think very much about it.
Now in March, this past Saturday, my son yells, "Dad, there's ants by the door!" Sure enough, there was a trail of ants running along the base of the door frame, looking like they were coming from somewhere inside the house. Got three of the bait packs and placed them along the side of the door. I managed to accidentally spill some of the fluid in one of the packs on the floor where I was placing the bait pack, figured that was fine and I'd clean it off after the ants were gone.
Within an hour or so there was a swarm of ants gathered around the spill and there were numerous ants inside all three of the packs that I had laid down. By that night there was maybe one or two ants I'd occasionally see, as of this writing the ants are gone. Bottom line, this stuff works, no question about it. Don't mess with the stuff you normally get in the supermarket, THIS is what you want if you're looking to have ants gone." —JamesMN
Get a box of six from Amazon for $4.89.