Hi Jim,The best product will have a chemical called "Fipronil"in it.I think you would need to get it thru an Agricultural store.It's expensive but people in my area usually buy it as a group and devide it.Important to use as directed it has a low application rate so it will last along time.The ants can't sense it so they carry it all thru their nest to the queen.We have a big problem with funnel ants in my area and it's by far the best.Some commercial operators will offer between a 3 and 5 year guarantee
