Aqueon Replacement Internal Filter Cartridge Large - 2 pack

Each cartridge acts as a two-stage filter. The dense foam outer layer removes dirt and particulates while inside the activated carbon removes odor, organics and discoloration. The rigid frame ensures that water passes through the cartridge, and not around it, for optimal water filtration. Dense foam mechanical filtration removes particles and debris Activated carbon chemical filtration removes toxins, odors and discoloration Small Cartridge fits QuietFlow Internal Filter models AT10 (one) and AT 15 (two) Large Cartridge fits QuietFlow Internal Filter models AT30 (one) and AT 40 (two) Replace approximately every 30 days for crystal clear water and proper filter operation