Create a clean and healthy underwater community with Seapora Rite-Fit Power Filter Cartridges from Underwater Treasure! Specially designed for Penguin Power Filters (sold separately)， these cartridges maintain a crystal clear aquarium through a multi-stage filtration process. Remove discoloration， odors， and organic impurities in a snap with state-of-the-art filtration technology— which includes dense glass traps—and an internal grid frame that evenly distributes carbon content.