The National Geographic Polishing Cartridge is a fine filter cartridge that traps small and large aquarium debris for clear water. Help maintain a healthy aquarium by changing the filter cartridge every 3-4 weeks.
Features: For use with PF20, PF30, PF50 Power Filters
Includes: 3 - Polishing Cartridge
Water Type: Fresh water
Dimensions: 6.75 in L x 2.75 in W x 0.5 in H
Caution: This is not a toy. Keep out of reach of children. To avoid injury, follow the safety instructions in the enclosed instruction guide.