Top Fin Тор Fіn Fіsh Тank Еlеmеnt Fіltег Сaгbоn Сaгtгіdgеs ЕF-S 6 Моnth Suррlу 2.1 х 3.7

They work very well for my Betta tank setup.

Very effective filter cartridges.

Although this still isnt the best price around (4 stars for the price), its better than getting it directly from a pet store, so I will give it that. Fit in my unit perfectly since its by the manufacturer, and did not harm my fish at all. Worked well, no complaints.

Works great and good price

Knock off product

Works great

PetSmart had been out of these for months! These are a great value!

Worked great for our fish tank

It works!

Exactly what I expected and needed for our tank