Aqueon Replacement Filter Cartridges are dual-sided, featuring dense-floss with over 25% more activated carbon than the leading brands. These patented cartridges were designed to ensure even distribution of activated carbon.

To use, simply rinse under cold water and easily install using the "FRONT" orientation tab.

Aqueon Replacement Cartridges are available in: X-Small, Small, Medium and Large. Replace cartridges every 4 weeks for optimal performance.

• Fits Aqueon QuietFlow Filter: E Internal 3 gallon
• Ready-to-use cartridge contains high quality activated carbon that keeps water clean (rinse before replacing)
• Installs in seconds: align cartridge bottom key slot for an accurate fit inside the filter
• For optimal performance, change every 4 to 6 weeks
• Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria
• Dimensions for X-Small: 5.24" x 1.75" x 5.7"