Aqueon Replacement Filter Cartridges, Medium – 6 pk
Designed with a dual-sided structure, these medium-sized filter cartridges contain over 25% more activated carbon than leading competitors. The patented design ensures an even distribution of carbon for enhanced water purification.
To install, rinse the cartridge with cold water and align it using the convenient FRONT alignment tab for a simple and secure fit.
| Size | Filter Type |
|---|---|
| X-Small | Small aquariums |
| Small | Beginner tanks |
| Medium | Standard-sized tanks |
| Large | Larger aquariums |
FAQ
How do I install the Aqueon Medium filter cartridge?
Rinse the cartridge with cold water and align it using the FRONT alignment tab for easy installation.
Are these cartridges compatible with all Aqueon filters?
Yes, these medium cartridges are designed to fit Aqueon filter models that use medium-sized cartridges.
How long do these cartridges last before needing replacement?
The lifespan depends on tank size, fish population, and water conditions. Typically, they should be replaced every 3 to 4 months.

Adrian Nolan –
The filter cartridges work well in my 20-gallon tank. Water clarity improved noticeably after a few weeks. Easy to install and the carbon seems to last longer than other brands I’ve tried.
Simon Hamilton –
I’ve used these in my freshwater setup for about two months. The water flow is steady and the smell is minimal. A little more carbon than competitors, which is a plus.
Anne MacLeod –
Great value for the 6-pack. Installed quickly and the filter performs consistently. My fish seem more active and the water looks cleaner.