Fluval Zeo-Carb Filter Media. Fluval Zeo-Carb is a premium blend of research grade Fluval Carbon and Fluval Ammonia Remover. Working together, these highly effective media eliminate liquefied impurities, odors and discoloration, while simultaneously removing toxic ammonia, for a clean, healthy aquarium. Combining two products into one frees up space inside the filter for other types of media. Key Features : Premium blend of research grade Fluval Carbon and Fluval Ammonia Remover Highly effective at eliminating liquefied impurities, odors and discoloration Also removes toxic ammonia Creates clean, healthy aquariums Frees up space inside the filter for other types of media For freshwater use only For Fluval filter models: 106, 206, 306, 406, FX5, 105, 205, 305, 405, 104, 204, 304, 404 2 sizes available (3 x 150g & 1200 g)