Which statement about Hydrothol 191's algae control is true?

• A. The liquid form is preferable for unicellular and filamentous algae
• B. The granular form is preferable for unicellular algae
• C. There is no difference between forms
• D. It is not effective against algae

Answer: (A)

The way the product is delivered in water matters for how well it contacts different algae. The liquid form of Hydrothol 191 spreads quickly and evenly through the water, reaching both free-floating unicellular algae and filamentous algae that form mats or extend through the upper water layer. That quick, uniform distribution means the active ingredient contacts and kills these algae more effectively across the water column. The granular form, by contrast, tends to settle and release more slowly, which can limit contact with surface or floating algae and lead to uneven control. So, for broad and rapid algae control that includes both unicellular and filamentous types, the liquid form is the better choice.