The Fluval Filter Media Set for AC Filters is the ideal maintenance kit for Fluval AquaClear AC external filters. It contains the essential filter media for regular replacement and ensures that the AquaClear filters mechanical, chemical, and biological filtration functions reliably. The set includes Bio-Foam, activated carbon, and BIOMAX. The Bio-Foam filter insert mechanically traps debris and promotes even water flow. The activated carbon helps remove odors, discoloration, and dissolved impurities from the aquarium water. BIOMAX provides a large surface area for beneficial filter bacteria to colonize, thereby supporting biological filtration performance. The Fluval Filter Media Set for AC Filters is available in versions suitable for the AC20, AC30, AC50, AC70, and AC110 models. Please select the appropriate version based on your existing Fluval AquaClear filter model. The filter media are suitable for freshwater and saltwater aquariums. Fluval Filter Media Kit for AC Filters+ Filte