The National Geographic Coarse Foam Cartridge is washable and reusable. This filter cartridge is used to remove suspended particles and large debris. The cartridge can be removed from its frame for easy cleaning. Features: For use with PF20, PF30, PF50 Power Filters Includes: 1 - Coarse Foam Cartridge Water Type: Fresh water Dimensions: 2.8 in L x 1.5 in W x 8.6 in H Color: Gray and blue Caution: This is not a toy. Keep out of reach of children. To avoid injury, follow the safety instructions in the enclosed instruction guide.