Hyrothol 191 is a broad spectrum algaecide and herbicide (salt of endothall). This product is a good alternative to using copper products. It is available in liquid or granular forms to control both floating and submersed aquatic weeds and algae. It quickly dissipates in the environment and will not bioaccumulate in fish or soil. Hydrothol 191 has a half-life of less than one week. It will not harm fish or wildlife and can be used to control hydrilla, milfoil, pond weeds, elodea, chara, spirogyra, and pithophora. It is effective in turbid water because it will not bind to suspended sediment.
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