Penn Plax Water World Prism Replacement Filter Cartridges - 2 count

The Penn Plax Water World Prism Replacement Filter Cartridges are a disposable carbon replacement cartridge designed to fit the Prism system. Keep your aquarium's water crystal clear by changing your Prism filter cartridges regularly.

• Quick and easy to change
• Change out monthly for optimum water quality
• Ready to use in your Prism system