[ankeny]

I had the same problem fought them for 6 months a losing battle. They do not take the bait back to the nest like other ants so that method is a waste of time. I finally gave up and called Deans (I’m sure any professional exterminator would work) by the time they treated they had established 3 colonies the exterminator told me there are over a million ants in each colony (I don’t think he counted them). He treated then came back in two weeks and retreated he told me it could take up to four treatments but mine were eliminated after two. I would suggest getting a professional involved otherwise they will only get worse.