TETRA Whisper Internal Aquarium Power Filter with BioScrubber, 20-40 gal - Chewy.com

Tetra Whisper Internal Aquarium Power Filter with BioScrubber

By Tetra
Rated 3.803 out of 5 stars

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$16.95Chewy Price
$39.79Chewy Price

In Stock
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About This Item


  • Features a submersible filter with a quiet, convenient, 3-stage filtration system—chemical, biological and mechanical.
  • Dual-sided Bio-Bag mesh that catches debris and fish waste with an activated carbon that absorbs odors and discoloration.
  • The bio-scrubber’s solid back allows the water to flow evenly over the bacteria-rich bristles for best performance.
  • Anti-clog design for convenient and easy maintenance also provided by the bio-scrubber.
  • 5-10 gallon uses medium Whisper Bio-Bag Cartridges; 10-30 and 20-40 gallon uses large Whisper Bio-Bag Cartridges.

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Compatible Products

Keep your system running smoothly with Tetra filter cartridges.

Questions & Answers

63 Customer Questions

What is the minimum amount of water (20 Gallon long tank) in inches needed for this filter to work properly? it is for a turtle
Answer by ChewyJan 12, 2018
To use this product you will need approximately 6-7 inches of water.

Would you recommend a small 5-10 or a 10-20 for a 10 gallon tank?
Answer by ChewyAug 07, 2019
To determine which filter is best for a 10 gallon tank, it's best to consider what type of fish is in the aquarium. For example, if you may have a betta fish then the smaller filter may be more appropriate however, if you may have other species or multiple fish in the tank, then the larger 10-20 may be better.

Can i use 2 filters for a 55 gal tank?
Answer by ChewyJan 23, 2018
You can certainly use 2 filters. Just ensure it's paired close enough to 55 gallons.

stupid question. does it also put some oxygen in the water.
Answer by ChewyJul 21, 2019
Filters move water from the top to the bottom of the tank, thus distributing oxygen throughout the aquarium.

ReviewsWrite a Review

Rated 3.803 out of 5 stars
264 Reviews
Would recommend to a friend

264 Customer Reviews

Filter by reviews that mention

Rated 5 out of 5 stars
By TimeBanditFan22 on Sep 28, 2022

Great Filter

I have three cats, and was looking for a filter. That could not be in the way. Of allowing for a tank cover. For the top. When I had goldfish as pets. At age 11. In a 20 gallon aquarium. I had one of those whisper-quiet filters that hung on the side of the tank. It was a great filter. This one is whisper quiet as well. It seems to be reliable in getting the tank clean. It sucks up whatever leftover flakes my two goldfish don’t eat. My cats have said hello to the fish. Sitting by the tank. But, never have really bothered them. I’m glad to have a filter. That can allow for a tank cover. It also is cleaning up the beneficial bacteria. It’s a slow process. But, I think it’s getting the job done on that too. With how powerful it is. Getting the leftover flakes sucked up.

Rated 5 out of 5 stars
By Ritz on Jan 31, 2023

Whisper Filter

Arrived on time, and well packaged. it works well and is very quiet. Very happy with the purchase.

Rated 1 out of 5 stars
By Charlieann on Feb 5, 2023

Stopped working

Filter stopped working this morning it was working great. No. Idea why it stopped working

Rated 1 out of 5 stars
By Alden on Oct 4, 2022

Complete Trash

This thing broke within a month of using it. I would never recommend anyone to buy this trash. When I first received it, the box was broken meaning someone opened it before, then I noticed something is the back of the filter was broken but I ignored it since it wasn't important. Please do not waste your money on this garbage.

Rated 2 out of 5 stars
By Mechele on Feb 13, 2023


The canister filter does not fit if aquarium has a top.

Rated 4 out of 5 stars
By Marha on Dec 10, 2022

Tomen el descuento de Navidad vale la pena

Trabaja bastante bien para una tortuga grande ahora esta lenta es hora d una nueva

Rated 1 out of 5 stars
By Jessica on Sep 28, 2022

Stopped working

I had it in my freshly cleaned tank for less than a week and it stopped working. There is a 2 year warranty but you pay for shipping so it wouldn't be worth the money. :(

Rated 5 out of 5 stars
By Muffin on Jul 14, 2022

Works better than expected

I am using this in a tall 5G and must say that it works better than I expected it to (compared to the usual teeny filters I use for small tanks). That being said, it is quite large and clunky. It takes up a lot of space in the aquarium. Not great if you have an aesthetic you're going for. On the good side, it creates great water movement, has an adjustable height, and uses high quality filtration, which I feel is uncommon in filters for small tanks.

Rated 5 out of 5 stars
By addie on Sep 11, 2022

Came back to write review

I came back 2 years later to say this filter is still old reliable. Followed the care instructions and it's worked wonders for my 20 gallon tall. Would recommend!

Rated 5 out of 5 stars
By Juan on Nov 1, 2022

Aquarium filter

This filters works great in my turtle tank. I have two in a 120 gallon tank