Aquacide Pellets - Selective, Root Killing, Systemic Herbicide 

Aquacide Pellets Controls submersed, emersed, and floating weeds. Aquacide Pellets are effective anytime susceptible weeds are actively growing. When applied in spring and early summer, less material is required, less dead weeds occur and a longer weed free period will result.More - http://www.killlakeweeds.com/products/aquacide-pellets