The Penn Plax Small World Replacement Cartridge for the Fishbowl Filter is designed to fit the Penn-Plax Small World filter kit. Filled with activated carbon this cartridge will help remove odors and discoloration in your bowl. Provides carefree maintenance, healthy fish and crystal clear water.

• Removes harmful gases and odors
• Clears up unsightly discoloration
• Top quality activated carbon
• Quick, easy, disposable