Lees Premium Under Gravel Carbon Cartridge 2pk

An easy-to-install cartridge with twice the high-grade, activated carbon of our Standard Disposable Carbon Cartridge. Premium Carbon Cartridges keep tanks sparkling clean! They are designed to fit our Economy, Original or Premium Undergravel Filters. For optimal performance, it is recommended that you replace your cartridges every 2-3 weeks. Contents: 2 Premium Carbon Cartridges