Marineland Replacement Carbon Filter Pack The Marineland Replacement Carbon Filter Pack offers filter cartridges to meet the absolute highest standards of water purification performance and operational ease. Each cartridge is preassembled, and 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 polyfiber. Features: Effective and safe Traps debris and waste particles Premium activated carbon