The included mesh filter bag contains over 1/2 lb of Activated Carbon. The Activated Carbon absorbs impurities in your aquarium water. Removes dissolved organic waste that can stress tropical fish and discolor your aquarium water. Activated Carbon Filter Media should be replaced every 4-6 weeks. Alternate the replacement of Activated Carbon Media with Sponge Media to maintain biological filtration. Key Features:10 oz. of Activated Carbon Media5" x 6" Mesh Filter BagExcellent Chemical FiltrationReplacement for Nano Cube Filter and Other Filters
