I have been fighting Red Ants for the past 5 years. I have 2 mounds about 3 feet around and no matter what I have used they always return. I was discussing this with a friend and he told me about a new product he picked up at the "Big Box Store". It is made by Ortho and was called something like Orthene (spelling??). Comes in a plastic bottle, its a white powder, and is about 10" tall. I bought some, sprinkled it around the mounds and it appears to be working better than I have seen anything do in 5 years. I'll check it out again this weekend and give a report after a week.