I was disturbed to find excessive dust in an area of my house. Although I only saw a few large ants, at night I could hear a faint chewing sound. I called Pestend, they understood the symptoms and send Salman round. He dusted inside the whole house (to stop the ants simply moving the nest) and left another product in my yard. The next two weeks were carnage, ant bodies everywhere, but the problem did not stop. Good news, Pestend's guarantee works!!! I e-mailed Pestend and they returned at no extra cost to dust again. This time the problem stopped almost immediately. Good job Pestend, glad I called you!