I have co-existed with ants for the last 10 years. Our house is built on an ant hill. I mean no mater where I dig in the yard I get ants. But I have over the years trained them not to cross my patios or climb on my walls. Every year, I get one or two large ant trails ( two to three inches wide) going from one side of the yard to the other right over my patio. What I do is spray the edges of the patio and sweep the ones in the middle off the patio and change their path. I like to think of it as a mutual respect thing. They move and I dont declare war on them.