Nitra-Zorb Size 50 (Single Pack)- These replacement cartridges are made of a high quality filter floss. Each cartridge is filled with Nitra-Zorb media, removing ammonia, nitrites, and nitrates. These cartridges fit API Superclean Power Filter 50.
Crystal Bio-Chem Zorb (3 and 6 Pack): These densely filled replacement cartridges are filled with not only carbon, but resins that help to keep your tank exceptionally clean. These cartridges fit API Superclean Power FIlter 50.