Replacement Filter Cartridge Medium for the Aqueon QuietFlow 10 Power Filter, E Internal 20 Gallon Filter and QuietFlow 20 Internal Shrimp Filter.

This is the BULK version. It's the same as the non-BULK version, but you don't waste money on fancy, useless packaging. 16-Pack.

NOTE: Contrary to ordinary logic, the QuietFlow 10 Power Filter and the QuietFlow 20 Internal Shrimp Filter use the same filter cartridge.