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

Exactly what I want. Cleans the tank. Not expensive. Easy. Its a little more work to put it together but not a big deal for the price.

Great stuff, My fish love it!

Killer product will buy again

Filters on the cheap great stuff.

Xcelent price and product. Im happy with the cristal clear water of my 50 gallons aquarium.

quick service, quality product

Great product way cheaper than at the local pet stores. And even though they need to be put together they are easy to do.

Absolutely useless. I ordered for the Tetra filtration system I recently purchased. Filtration bags are 5 inches wide Tetra sends replacement bags which are 3 inches across. I regret buying a Tetra system

These filter are perfect! And they are half the cost for as many at any pet supply store or even walmart

These are really good filters for a few reasons: I like their price point for the quantity of refills and it represents a good value. I also like the amount of charcoal that comes in each refill pack because they appear to do a good job filtering through the water in my 5 gallon betta tank with a medium water pump I keep on the lowest setting. The filter material itself is good quality material too that doesnt break open. Lastly, these are easy to use with the attachments included and they fit securely and snuggly in the pump. These are now my go-to filters after evaluating their performance and consistency, so have become standard filters I will continue to use from now on!