BFG1166 Features: * Filter * Reduces dissolved toxins from fish waste * Works in any filter * For use in freshwater aquariums * Promotes fish health by improving water quality * Phosphate free * Keeps aquarium water crystal clear and ammonia free Options: * Available in 9 oz., 18 oz. and 37 oz. sizes Dimensions: * 18 oz. Dimensions: 9" H x 2.75" W x 2.75" D * 37 oz. Dimensions: 9" H x 3.75" W x 3.75" D * 9 oz. Dimensions: 5.4" H x 2.8" W x 2.75" D