CrystalClear, 25 LB, Pond & Lake Treatment +, Removes Sludge, Breaks Down Dead Algae & Debris, & Removes Odor Fast, Safely & Economically, Pond & Lake Treatment & Contains A Strong Family Of Bacteria & Enzymes Cultured On A Barley Substrate To Remove & Fight Persistent Pond Problems, Safe For All Aquatic Life, 25 LB Bucket Treats 3,760,500 Gallons.