Ready to use filter cartridges trap dirt, remove impurities and make your aquarium water sparkle. Packed with Black Diamond Premium Activated Carbon that works twice as fast and keeps working long after other carbons quit.Replaces MechaniChem Filtration Cartridge.
New tight-seal cartridge design prevents water bypass. To install, rinse and press down firmly.Better than a bag. No messy assembly required.
Changes in seconds, just shake and rinse.
For best results, change every 21 days.