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Hydrothol Granular | Aquatic Herbicide - Lake Restoration Hydrothol® Granular is a broad-spectrum herbicide, meaning it kills many types of aquatic lake weeds. Since Hydrothol® is also an algaecide, you can effectively ... Hydrothol Granular 20lb Bag - Aquatic Biologists, Inc. HYDROTHOL 191 Granular with alkylamine endothall is a selective, rapid-acting, contact herbicide and algaecide. Very effective against a broad spectrum of ... Hydrothol 191 Granular | Aquatic Weed & Algae Control Hydrothol® 191 Granular Algaecide/Herbicide is a selective, rapid-acting, contact herbicide and algaecide. Controls submersed weeds and algae in lakes, ... Hydrothol 191 granular