I put down a perimeter around my house to deal with a little carpenter ant problem. I also put a little bit in a jar lid in the house in a corner where I'd seen ant activity. The carpenter ants haven't had the slightest interest in it. There are some field ants that live near my driveway that LOVE this stuff, but it doesn't seem to kill them. They've been very actively eating it for over a week, and I only see more of them. Since killing field ants wasn't my goal, I don't much care, but it seemed worth noting.