The Slim S10 Power Filter bundle pack comes with a filter and filter media. The Slim S10 Power Filter's unique design is compact and slim, thus reducing space behind your aquarium. The filter comes equipped with an adjustable flow control so you can control the water flow level in your tank. The Slim S10 Power Filter's motor is submerged in the tank for a quiet operation and an easy start-up since no priming is required. Installation and maintenance are quick, easy and convenient and the Slim S10 Power Filter includes 2 filter cartridges: 1 Bio-Carb and 1 Bio-Clear. Both cartridges contain Ceramitek, which is engineered to optimize biological filtration, for a healthy aquarium. The Marina Slim Filter Carbon Plus Ceramic Cartridge combines activated carbon and Ceramitek in one cartridge for a healthy aquarium. The activated carbon effectively removes pollutants and odors, 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. Make sure to never replace all filter cartridges at the same time in order to ensure constant presence of beneficial bacteria. The Marina Slim Filter Zeolite Plus Ceramic Cartridge combines Zeolite and Ceramitek in one 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.