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.Fluval Zeo-Carb+ chemical filter media+ premium blend of research grade Fluval Carbon and Fluval Ammonia Remover+ highly effective at eliminating liquefied impurities, odors and discoloration+ removes toxic ammonia+ creates clean, healthy aquariums+ suitable for freshwater aqauriums only