AQUAEL Multi Cartridge Pro Carbomax Plus is an extension cartridge for the AQUAEL Multikani external filter. The cartridge is filled with activated carbon granulate and is used to remove colour or odour substances from the aquarium water. It can also be used after a medicinal treatment to remove residual medication. The activated carbon does not need to be rinsed before use. After about 4 weeks the activated carbon is exhausted and should be replaced.AQUAEL Multi Cartridge Pro CarboMax Plus+ extension cartridge for AQUAEL Multikani+ filled with approx. 1 litre activated carbon CarboMAX Plus+ to remove discolouration, odours etc.+ cartridge can also be filled with other filter media+ suitable for fresh and sea water