Lees Premium Under Gravel Zeolite Cartridge 2pk

An easy-to-install cartridge with twice the Zeolite of our Standard Disposable Zeolite Cartridge. The Premium Zeolite Cartridge solves the common ammonia problem that fouls aquarium water and destroys livestock. Designed to be used with our Economy, Original or Premium Undergravel Filters. For optimal performance, it is recommended that you replace your cartridges every 2-3 weeks.