During periods of heavy rainfall, it is possible that the effectiveness of our product will diminish in less than 6 weeks. We are confident that regardless of weather, our product will continue to work for at least 3 weeks. If we need to re-treat your yard in less than 3 weeks, we will do it free of charge.
The best way to find out if your yard needs to be re-treated is by shaking a bush on a sunny day. If mosquitoes fly out of that bush, your yard needs to be re-treated. If they don't, then that invisible residue is still working, and a re-treatment is not necessary. If you have noticed mosquitoes in your yard, they most likely have recently been blown into your yard, and once they land to rest on any treated areas, they will die.