Fluval AquaClear 30 Media Maintenance Kit simplifies upkeep of your AquaClear 30 filter by providing all the replacement media in one package. The kit includes a new foam sponge for mechanical filtration, an activated carbon insert for chemical filtration, and a BIOMAX ceramic ring insert for biological filtration. Replacing all three stages at once refreshes the filter’s performance, ensuring effective debris removal, clear water, and robust beneficial bacteria populations in your aquarium.