Aqueon Replacement Filter Cartridges for QuietFlow FiltersAqueon 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