The termite insecticide (Termidore) should be injected around the foundation. If the area you live in has hard packed clay beneath the surface, the insecticide will not penetrate very deeply and it will be much less effective. Injecting the insecticide every 12-18 inches, which reputable companies do, solves most of that problem. Secondly, the insecticide has a limited life. Most pest control companies will tell you the effective life span is 7 years, so if you're at 10 years, you're probably well overdue for retreatment.
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