A one-time treatment with TERMIDOR around the periphery of the whole house lasted for 14 moths before ants came back inside and I had to repeat the treatment. Carlos Cea from Hydrex Pest & Termite Co (818-249-9815) did an outstanding and long-lasting job at a resonable cost. Over a year ago, ants had invaded the whole house. I felt overwhelmed after battling ants for months, having spent hundreds of dollars on all kinds of DIY ant controls without success. It was a great relief to have Hydrex do such an instant, effective treatment for less money than I had already spent on my own, futile attempts to get rid of the ants.