Marina Bio-Clear Cartridge, 3 pack

*Slim Filter Bio-Clear replacement cartridge fits all 3 Slim Filter Models.
*Ideal for goldfish, it combines zeolite and Ceramitek in 1 cartridge for a healthy aquarium.
*The zeolite effectively adsorbs toxic ammonia and reduces stress on fish, while the Ceramitek, a highly porous ceramic biological filter medium optimizes biological filtration.
*The easy to use disposable cartridge should be replaced every two weeks.
*Never replace all filter cartridges at the same time in order to ensure constant presence of beneficial bacteria.