BioSafe Systems markets AzaGuard Ready to Use Insecticide/Insect Repellant. AzaGuard RTU is eco-friendly in both its ingredients and packaging. This unique packaging allows the home gardener to have three individual refill applications equal to 96 fluid ounces with the purchase of one product. Simply pour an ampoule into the side, fill the bottle with clean water, and they are ready to do battle with over 300 insect species.