Patented Aqueon dual-sided dense-floss cartridges contain over 25% more activated carbon than the leading brands. These unique cartridges were designed to ensure even distribution of carbon throughout for more thorough filtration and longer cartridge life.

• High quality activated carbon keeps water clean
• Align cartridge bottom key slot for an accurate fit inside the filter
• Rinse under water to remove carbon dust before replacing
• For optimal performance, change approximately every 4 to 6 weeks
• Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria
• Dimensions: 7.7" x 5.5" x 8.6"