Waste-away lowers phosphate and nitrate plus it removes hidden wastes and dirt from gravel and coral beds!_x000D_ Drtim's waste-away is a unique combination of bacteria that attack and dissolve organic wastes in the aquarium quickly. Waste-away works to unclog coral beds and keep filter pads freely flowing longer. This results in better water flow, more oxygen and a healthier aquarium environment. Even with good maintenance and monthly water changes, sludge and wastes remain in the aquarium in hard-to-reach and hard-to-see places. Waste-away, a 100% natural, beneficial bacteria-based product, removes cyanobacteria and aquarium slime, leaving your tank clean! Contains no phosphates_x000D_ 100% natural_x000D_ unclogs and cleans gravel and coral beds_x000D_ keeps filter pads cleaner and flowing longer_x000D_ removes hidden wasteswaste-away should be used on a regular (weekly) basis to keep sludge from accumulating which can negatively affect fish and corals. Caution: when using in a tank