Check the listing for details. Cascade 150/200 Filter Cartridge 3 Pack. Condition: New. Listed at 18.33 USD. Keep your aquarium clean and clear with the Penn Plax Cascade 150/200 Filter Cartridge. This pack contains three cartridges, each designed to fit filters in the Cascade 150 and 200 series. Made for both fresh and saltwater use, these cartridges are perfect for any aquarium enthusiast. The cartridges are made with high-quality materials to ensure long-lasting use. They are easy to install and can be cleaned and reused multiple times. With the Penn Plax Cascade 150/200 Filter Cartridge, maintaining a healthy and beautiful aquarium has never been easier.