Generally, we find black ants entering houses from the garden or patio in search or sugar and other carbohydrates. In the summer breeding months they produce huge flying ant versions of themselves and swarm into homes in huge numbers. A prolonged campaign of ant-gel baiting through specialist and safe bait-station programs is required.
Pharaoh, Rogers and Ghost ants invade institutional building such as clinics, hospitals and food processing facilities and easily spread, often through the very efforts being made to control them! Ant control is specialised work and requires patience and dedication.