CrystalClear, 2 LB, Biological Clarifier+, Naturally Removes Sludge, Odor, Grime, Debris & Decaying Leaves With Billions Of Bacteria Colonies & 6 Added Enzymes, The Result Is A Cleaner Pond, Healthier Fish, Improved Dissolved Oxygen Levels & Reduced Ammonia Levels, Biological Clarifier + Contains Activated Barley, Safe For All Aquatic & Domestic Animals.