Boost your filtration efficiency by adding the beneficial bacteria that eats up the nutrients that otherwise algae would! Do you have the water clarity of pea soup (single-celled planktonic algae)? Aquatic Designs suggest you add this directly to your filtration system and the pond itself. A great pairing with this product would be the Barley Straw extract. Barley Straw Extract will also contribute in stopping any further growth of single-celled planktonic algae and also string algae.