easy-to-apply Pond-clear Solutionresidue-free Natural Cleanerharmless To Humans, pets & Wildlifenatural Solution for Keeping Your Pond Clear During The spring & Summer Season When Algae & Blanketweed Blooms In The Sun.when This Extract Of Barley Straw Breaks Down In Sunlight Over Time It Produces bacteria & Enzymes Which Inhibit Algae & Blanketweed Growth & Keep Your Pond From Turning Green.natural & Harmless To Humans & Wildlife Its A Great Treatment To Make green Or Opaque Ponds Clear once Again. Because Its An Extract Of Barley Straw You Wont Have Straw Floating On Your Pond As It Breaks Down.see The Bottle For Dosage Instructions. treats A 13 square-foot Pond, 9 Inches Deep (around 1000 Gallons).