We have had a tough time in the summer being able to spend time outside, especially in the upper level of our yard where the dog loves to chase her ball. I wanted to treat the yard for mosquitos, but didn't want the chemicals. I tried the natural spray, beginning this past May and it's been wonderful. So far, our problem with mosquitos seems to be gone. The technicians are very thorough in applying the spray and they are here every two weeks! I highly recommend Mosquito Shield!