Cartridge Carbon Media B503

Penguin Filter Cartridges feature Black Diamond Premium Carbon to keep your aquarium water crystal clear. These Marineland filter cartridges trap dirt, remove impurities, and deliver maximum water-to-carbon contact. It is easy to know which Penguin filter cartridge you need, as all filter cartridges are all labeled using Rite-Size sizing. Each Rite-Size cartridge size matches specific aquarium filters, so you can always order the correct filter cartridge.