Although the Whisper filters come in several different sizes, we tested a Tetra Whisper 40 for this review.
The filter definitely feels plasticky, but it seems solid and well-constructed enough. It comes with everything you need inside the box, but we recommend buying better quality filtration media.
The first thing we noticed when we started it up was a buzzing, rattling sound.
Other reviews on the noise level are mixed, so it seems like it may be a quality control issue. After taking it apart we determined that the impeller tube assembly, which is in two separate pieces, was not seated all the way and was causing the noise.
When setting this filter up, make sure the impeller tube assembly is aligned properly and pressed in all the way, and you shouldn’t have problems.
Even after fixing the impeller assembly, the Whisper Power Filter 40 is far from being “whisper quiet.” It’s not deafening or anything, but it’s also not as quiet as higher-end filters. That being said, this thing works very well.
It has a good flow rate, and it was able to keep the water on our 30-gallon tank impeccably clear. The media basket design also allows you to play around with customizing your own media mix.
A big selling point of this filter is the ability to easily adjust the flow rate using the dial mounted on the top. We found that this worked very well, even better than the flow controls on more expensive filters.
The simple design of this filter makes it very easy to clean, and maintenance in general is fairly infrequent and trouble-free.
Overall, we were very happy with the performance of this power filter, and wouldn’t hesitate to put it on any of our tanks.