A great value pack of replacement media for your Fluval external filter. This pack contains essential media to improve aquatic conditions and fish health. Fluval Extra Value Media Pack for 305/405 306/406 6 x Fluval Water Polishing Pads (Remove after 7-10 days) 3 x Fluval Activated Carbon (Replace every month) 3 x Fluval Ammonia Remover (Replace every month)