Dr. Tim's Waste-Away Sludge Busting Bacteria (Reef)Waste Away is a unique combination of bacteria that attack and dissolve organic wastes in the aquarium quickly. Even with good maintenance and monthly water changes, sludge and wastes remain in the aquarium in hard to reach and hard to see places, and are dissolved in the water. Waste Away, a 100% natural, beneficial bacteria based product, works to quickly find, break down and remove these wastes. Dissolves sludge and dirt Unclogs gravel coral beds