Aquarium MastersReplacement Aquarium Carbon Filter Cartridge for Whisper Power Filter 20i, 40i, C 20, 30, 40, 60 & The Old Top Fin Power Filter Old 20, Old 30, Old 40, & Old 60, Model 55!

Nice sturdy filters. They fit my filter well, but they are a little shorter than the original filters. The shorter height does result in slightly reduced surface area, but does not result in a noticeable reduction in performance.

Liked. It did the job

Worked great. Cleared the water of my 20 gallon tank within 12 hours. Fits perfectly on my TopFin filter.

They didn't fit the pump as listed. Had to "modify." :)

It was just what I needed for my 10 gallon tank.

The packaging states that this fits TopFin 20 - 60 Power Filters. These cartridges fit the old TopFin models, but they do not work with the new models. I've included a picture of the old versus the new filter packaging. This is the reason why half of the comments say the cartridges fit, and half say they don't.Also, if you are considering using this cartridge for a Whisper filter, you might want to compare these cartridges to a Whisper Bio-Bag. The Bio-Bag floss is thicker, there is more carbon, and the Bio-Bags are actually less expensive per cartridge.

Used it for my fish aquarium

For the price it worked out perfect easy install

Removing the 5 star as this was only other filter that fit my top fin and I love how thin but filled it is lots of carbon good for cleaning my goldfish tank And getting rid of aquarium smell. I bought 3 pac for $14 how could this same exact one I been purchasing ( when it was available through prime) for $14 be over $55 due such small 30 gal tank filters . Marineland 6 pac is in good price for same as 3 $12