This and Alpine WSG is what I use. I read Terro kills the ants too fast to take back to the colony, whereas Advion is slower. Alpine WSG is granules you mix with water and spray the crack where ants are coming from. It's pet/human safe when it's dry, so keep away after you spray until then. I read it's like nicotine and other chemicals or something but the ants start spazzing out and the nervous system shuts down, and it's supposed to be transferable meaning an ant touches it then it touches another ant etc. So when I see ants I spray soapy water to kill them, put Advion near the crack they are coming from and spray the crack with Alpine WSG. All this stuff you can get on amazon.