Tetra Whisper Bio-Bag Filter Cartridges For Aquariums - Unassembled Medium (Pack of 12)

These are great! you can add bio rings to these to maximize your tanks bio load. I like to load up a mesh water with Fluval bio rings and then throw those in these bags. This way you dont have to only rely on those blue bio boards (not good enough bio load capability for my tank).

Great

I LIKE BECAUSE IT HELP KEEPS THE TANK CLEAN.

This is a great solution if you change your filters often. I have bought several boxes. My only complaint is these filters are pretty course. It would be nice to have a choice between a fine and course filter.

Have no doubt, this will clean your fish tank.

These work just as well as the pre-assembled filters. For a little work, you can save a ton of money and have the same functionality. Highly recommend.

One frame with four bags of media, four filters and four tablets for clean water, if you buy the single pre assembled you can keep the frames to re use. This only takes a few steps to put together then a quick rinse before use. Using the M size in my Reptofilter, which takes two at a time.

Good

good price and these cartridges are easiest to find, especiaaly in bulk, and easy to assemble keeps tank clean, nice product

The fliters are very easy to use, work well & last a long time. For the money it is a good buy!!