These are genuine replacement media packs for the fluval 04 05 and 06 external filters this pack contains essential media to improve aquatic conditions and fish health the fluval extra value media packs provide essential replacement water polishing pads replacement carbon and ammonia remover to eliminate dirt toxins and odours for clean and healthy water fluval extra value media pack contents summary 36 x fluval water polishing pads remove after 7 10 days effectively traps micro part