Depends on the kind of ants. If they are the small sugar ants that come indoors, definitely Terro is the way to go. I had a HUGE ant problem on my lanai. Not sure the kind of ant, but not sugar ants. They were living under my spa, I think. Anyway, I was getting ready to call a professional, but decided to try an outdoor pest solution I got at WalMart. It is by Ortho, I think. Not a canned spray, but a large container with an attchable nozzle. It's used for roaches and palmetto bugs, too, which is a huge problem in Florida. I sprayed the trail for several days, and put down bait. It didn't kill them, but soon I saw big ants moving out (maybe Queens)? and haven't seen them back. Even though the spray said once every few weeks, I did it every day, and it solved the problem.
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