Aqueon Replacement Filter Cartridges for QuietFlow Internal Power Filters feature a patented, dual-sided dense-floss design and contain over 25% more activated carbon than competing brands. These cartridges provide even carbon distribution for more thorough filtration and longer effectiveness.
Activated carbon and foam filter cartridges for QuietFlow Internal Power Filters
Pre-assembled and ready to use
Provides highly efficient mechanical and chemical filtration
Directions: For optimal performance and crystal clear water, change cartridge approximately 30 days.

Specifications:
Small:
For QuietFlow models AT10 and AT15
3.38"L x 1.38"W x 5.75"H

Large:
For QuietFlow models AT30 and AT40
4.5"L x 2"W x 5.75"H