I had exact issue in wall in bathroom. I took sledge hammer to wall, to see huge mound. I killed the ants. Then they appeared at electrical outlet across from hammered hole. I didn't use the same remedy as this, I used something else; I can't remember. But I do recall it being gooey. This was 18 years ago; no ants since. Demon works on ants but ants take food to queen. Demon is not that type of bait. It kills on contact. Demon WP is for perimeter spraying in/out home. Used it from here for over 19 years. Love this place
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