Fluval zeo carb 1200gis a premium blend of fluval carbon and fluval ammonia removerworking together these highly effective media eliminate liquefied impurities odours and discoloration while at the same time removing toxic ammonia for a clean healthy aquariumr r combining two products into one gives you more space in your filter system for other types of mediar r replace once a month more often if aquarium is heavily populatedremove when medication is being administered in aquarium