ST ARiSEN Gold contains nitrifying and beneficial bacteria strains with an extremely powerful decomposing capacity. Toxic ammonia and nitrite are transferred to a safe state like nitrate and organic compounds in the aquarium are broken down to purify water. The living bacteria are stable and will not overreact in the bottle but rather ST ARiSEN Gold maintains its effectiveness by promoting bio-elements are also added to ST ARiSEN Gold to activate and enhance the reproduction of bacteria in a short amount of time which builds up the powerful biological cycling system. ST ARiSEN Gold can rapidly jump start the proper biological filter system for a new aquarium and maintain a safe and stable filtering environment. Features Capacity - 4000 ml. (1 gallon.) Dimension - 9 x 5 x 9.5 in. Item weight - 10 lbs.