AQUAEL Multi Cartridge Pro BioCeraMax Pro an extension cartridge for the AQUAEL Multikani external filters. The cartridge is filled with BioCeraMax Pro 600, a filter medium for biological filtration of aquarium water. BioCeraMax has a huge surface area of approx. 600m/l and provides ideal conditions for useful purification bacteria. The water becomes clean and clear.AQUAEL Multi Cartridge Pro BioCeraMax Pro+ Extension cartridge for AQUAEL Multikani+ filled with approx. 1 litre BioCeraMAX Pro 600+ for biological filtration of aquarium water+ Cartridge can also be filled with other filter media+ suitable for fresh and sea water