I've used many ant poisons and many of these so-called
solutions have been pretty costly as I've succeeded mainly
in moving these unwelcome guests from one place to another.
But there is another way, I have discovered that the most
efficient and effective ant killer is something that is
normally lost down the drain-dishwater! After washing
dishes, I collect the water in a one-and-a-half gallon jug
that washing bleaches and detergents come in. I start at
the outside of the ant hill and work toward the center. I
do this as quickly as possible, as ants come to life fast,
and I cover most (if them. When I get to the point that
water goes in the hole, I continue to pour the rest down
into the nest. The ants that come to the surface seem to
die and disappear. The next day I find no activity.