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.

• 2 Count Aqueon replacement internal filter cartridges (1 packs of 2)
• Each small size cartridge measures 3.4 x 1.4 x 5.8 inches
• Dense foam mechanical filtration removes particles and debris
• Activated carbon chemical filtration removes toxins, odors and discoloration
• Small cartridge fits QuietFlow internal filter models at 10 (one) AND at 15 (two)