Barley Flakes, are the actual barley grain, which begin to clarify in about half the time as our traditional barley straw and approximately three months of water clarifying qualities.These elements combine to create a condition which keeps water clear Barley straw promotes healthy populations of invertebrate life that consume harmful contaminates. These tiny creatures are important to the food chain in the pond. All these processes combine to produce a clearer, healthier and long lasting pond environment.#01152 Barley Straw Flakes 5000 Gallons