Your service tech Mike spent a lot of time spraying in all the rooms of my house and in my crawl space. He was very pleasant and patiently answered my many questions. When he came back to check things one week later, I told him that I was not happy that there were still a few ants in my house. He assured me that they were stragglers and that they would eventually disappear. It is now 5 days after his second visit and there are still a few stragglers, but the numbers seem to be diminishing every day.