I read on a gardening site last week, but am anxious to try it this summer...
The guy said empty two packets of Nutra-Sweet near the entrance of the hill. Within a couple of days, they are gone. I'm assuming he was speaking of a regular sized small ant hill. Guess you could grab a couple packs at Mickey D's to try it, and out nothing..., or if you already use it, a few more for a larger hill.
He went on to say that one company is buying Nutra-Sweet in bulk, and repackaging as ant killer... Take it for what it's worth...
I'm sure it will come up, if you Google, Nutra Sweet+ant killer.
I never use it, but if its true, I'm dang sure NOT going to..!!