This kit includes all the relevant replacement media for the Medium, Large and Extra Large models of Askoll Pure Aquariums. It is recommended to replace these media kits on a monthly basis. The care is incredibly easy thanks to the Askoll Rolling Filtration System, a simple and intuitive maintenance program for replacing filter materials: all for a natural experience that is pure enjoyment. What you need to keep your aquarium Askoll Pure M, L or XL always fit and healthy. The maintenance kit contains the spare materials required to maintain the filter system: just open the lid and replace the bags or filter sponges with those supplied following the recommended schedule, and the aquatic world is easily maintained. These are all dry operations - like inserting a capsule in the coffee machine - so there is no need to get your hands wet. Contents: 1 sponge for mechanical filtration 1 active carbon cartridge for chemical filtration 1 anti-nitrates and anti-phosphates Mix cartridge for chemical filtration