MARINA Slim Filter Bio-Clear Cartridge with Zeolite
The Slim Filter Bio-Clear replacement cartridge fits all three Slim Filter models. Ideal for goldfish, it combines zeolite and Ceramitek in a single cartridge to ensure a healthy aquarium. The zeolite effectively adsorbs toxic ammonia and reduces stress on fish, whilst the Ceramitek – a highly porous ceramic biological filter medium – optimises biological filtration. The easy-to-use disposable cartridge should be replaced every two weeks. (Never replace all filter cartridges at the same time to ensure the constant presence of beneficial bacteria.)
Source: www.petland.ca