Boric acid: Mix 1 cup of sugar, 4 teaspoons of boric acid and 24 ounces of water in a glass screw top jar. Shake thoroughly until you can see that all the crystals are dissolved. Now put 1 cup of this mixture into a smaller jar which you have filled halfway with loose cotton. Firmly screw the lid back on, seal around the band with weatherproof tape and using an awl punch a few small holes in the center of the lid. Put this near the entrance of the nest or wherever they have made a path to your house. The key is the ants will get into the jar to eat the Sugar and return to the nest and pass it on to the rest of the colony. If you find many dead ants by the jar dilute the solution and try again. With a proper mixture the colony may be destroyed in a few weeks. It does take the destruction of the queen to completely eradicate a colony. Keep this away from kids and pets!