Which endothall products are available for aquatic use?

• A. Dipotassium salt Aquathol K; monoamine salt Hydrothol 191
• B. Aquathol K is a monoamine salt; Hydrothol 191 is a dipotassium salt
• C. Granular endothall only; no liquid form
• D. Hydrothol 191 is not used for algae

Answer: (A)

Endothall products used in water come in two labeled salt forms: Aquathol K, which is the dipotassium salt, and Hydrothol 191, the monoamine salt. These two forms are both approved for aquatic use, with Aquathol K commonly available in a granular form and Hydrothol 191 as a liquid concentrate. They’re used to control submerged vegetation and algae in ponds and other water bodies, following the label directions.

The other statements mix up the salt forms or misstate how these products are used. For example, one form being a monoamine salt and the other a dipotassium salt is reversed, and Hydrothol 191 is indeed used for algae, not excluded.