Top Fin EF-S Element Filter Cartridge Value Pack 12 Month Supply 2.1 in X 3.7 in

These filters work good. Havent had to change as the directions state may be because only have 1 beta fish in a 3.5 gallon fish tank. These are more expensive though through here.

Filter works as it is supposed to. Satisfied.

Fits well and keeps the water clean

Does what it should. Easy to install

Works

Great product. Quick shipping.

Very good filtering.

I loved how easy it was to install

Fine product. Wish amazon didnt run a forklift over it before they sent it to me.

Easy to replace and easy to use