At Marineland, we design our filter cartridges to meet the absolute highest standards of water purification, performance and operational ease. Each pre-assembled cartridge slides easily into place, providing superior mechanical and chemical filtration and making replacement fast, dry and effortless. The cartridge mechanically filters water through a pad of double thick poly-fiber.  Debris and waste particles are trapped, and water is chemically filtered through Marineland's Black Diamond Premium Activated Carbon. 

Inside the cartridge, a patented ribbed backing ensures even distribution of activated carbon to deliver maximum water-to-carbon contact.  The result?  Crystal clear, crystal clean water.  Choose 2 Pk or 4 Pk