Many times, mosquito are easier to kill in their earlier stages, so in addition to the spray, we also offer a larvae-preventative/extermination service. If you have a koi pond or other man-made water container, this may be a good service for you. The technicians simply drops several small tablets in the water, which will exterminate the larvae before they reach maturity and prevent new larvae from developing. These tablets are completely safe for all marine life and any children or pets who may go in the water.