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

Arrived as promised and easy to assemble

Use it with the whisper PF 10 filter, seems to be working ok. When I do the water change there is food at the bottom of the tank, so I am not sure if the filter is doing its job or not..... But the betta and its two friends are alive and well, so I guess its working

Nice product.

Perfect for what I need. My fish loves it too. I especially like that there are no harsh chemicals involved in the production of this bio-bag.

Filters fairly well but not as well as other type filters. Unfortunately if is the only filter that will fit the filtration system I have ad S it is built into the tank.

The product does exactly what it says. I have a 20 gallon turtle tank for my turtle and it filters very well. I have used the first pack for a while now and it works great. The price is also amazing. It is two time cheaper than the ones that are sold in most pet stores. Will buy again once I run out.

Ive already ordered two about to order my third box easy to put together works really good keeps tank extremely clean I love these tetra is awesome. Highly recommend.

I wish you offered the cartridges without the charcoal.

Does a really nice job at keeping the fishtank clean.

I like these filters, easy to replace. Makes keeping my tank clean a breeze. I like the multi-pack. I go through a filter a month. Great to have if you have an aquarium.