EasyPro: Propeller Broad Spectrum Herbicide - 5 lbsQuick Facts Propeller is a fast acting, contact aquatic herbicide that controls selected submersed, emergent and floating aquatic weeds. It is most effective when applied to young, actively growing weeds in water with a pH of less than 8. 5. Product Description Controls selected submersed, emergent and floating aquatic weeds Ideal for duckweed, watermeal, Eurasian milfoil and water lettuce Non corrosive, fine granule mix with water to apply Available