In Michigan, most aquatic pesticides may be applied by individuals with proper authorization, including a permit, if required, and permission of the property owner. However, the majority of treatments are carried out by certified applicators. If you decide to apply chemicals on your own, be sure to follow all directions as indicated on the product label to protect yourself, others, and the environment. Certain chemical products, such as those with the active ingredient imazapyr or carfentrazone, can only be purchased and applied by certified applicators.