Borax or boric acid (which is almost the same thing) - it is a strong and effective ant poison. You will have to go to the trick in order to they eat it. You need to make poisoned borax balls borax as a bait. To do this, take 2 egg yolks, and 0.5 teaspoon of borax, make small balls and place it where ants run.

Important: Do not increase the concentration of the chemical, otherwise ants will fall down dead before they reach a nest.  Ant must be able to move the ball into the nest, smeared with powdered borax, and taste it, then died of intoxication, and then other ants will pick up this ball – so a lethal chain reaction will start. This is the easiest way of ant control – read more in our review 7 the best fire ants killers.