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I have had this issue before and last year was horrible. I tried everything I could , Toro, Borax etc...even had a company come spray and still had ants.
Finally a friend of mine referred me to a guy who came out and sprayed and he sprayed in the house and an entire 20ft perimeter around the outside.
He said you have to lay a barrier down they cant cross. Think of it as a pesticide minefield or moat.
It worked right away the rest of the year was ant free.
The other company had just sprayed along the outside of the house around the foundation. That's not enough if you a large ant population which you probably do.
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