Whisper® Internal Aquarium Power Filters

The Tetra Whisper internal aquarium filter is the ultimate in quiet, convenient 3-stage filtration. The dual-sided mesh of the Bio-Bag® catches debris and fish waste while the activated carbon absorbs odors and discoloration. Biological filtration is provided by the Bio-Scrubber. Bio-Scrubber's anti-clog design provides complete biological filtration with the convenience of less maintenance. Because the Bio-Scrubber has a solid back, water is forced to flow evenly over the bacteria-rich bristles. The filter is submersible.
Whisper® Internal Aquarium Power Filters is rated 3.1875 out of 5 by 48.
Rated 5 out of 5 by from Good little unit I have owned my Whisper 3i for about 2 years. It has provided constant filtering and kept my 2.5 gal. tank clear. The suction cups now need to be replaced and Tetra is sending them out to me at no extra charge. Great customer service! The tank clip version does not attach properly to the 2.5 gal. tank, but they can be fitted with the suction cups from Tetra. Good little unit.
Date published: 2016-09-15
Rated 1 out of 5 by from Whisper 10i power filter I bought this filter a month ago and had a hard time keeping upright in my 10 gallon tank. I found out from the pet store my filter did not come with the suction cups that would fix it to the back of my aquarium. I had the filter in for 10 days and the aquarium started to cloud up. I have been feeding the fish the same amount of food as I did before the aquarium filter and never had clouding problems. I even bought another biobag filter cartridge and cleaned it first under the tap water as instructed and still have been getting cloudy water within 3to 4 days. I am not very happy with this filter. I only have one large 4 inch goldfish in the tank. I cannot figure out why it will not keep my ten gallon tank clear.
Date published: 2016-09-14
Rated 5 out of 5 by from Still worked great I got one from a garage sale. It was missing a bunch of parts and left unclean in the used aquarium I bought. Probably been sitting dry for years from the looks of it. I cleaned it up, put in a new filter bag and plugged in the power. WOW! The pressure and flow was high and instant. Works great! Now I just need to get the missing parts like one more suction cup or hanger hook.
Date published: 2016-08-31
Rated 5 out of 5 by from Love this product. My fish and I love this product. I followed the instructions. The best part of this is the relaxing sound of water that I fall asleep to. Customers with concerns need to fill their tank and/or change filter.
Date published: 2016-08-28
Rated 5 out of 5 by from used these for years I just purchased a new one to replace one I had for a number of years. I use the whisper filter in my class aquariums. They are easy to set up and are quiet and easy to change the filters. I have 2 medium and 3 large ones (in various aquariums).
Date published: 2016-08-19
Rated 1 out of 5 by from Not working!!!! I just bought this 6 days ago. The first couple days it worked like a charm! Water was crystal clear! Then one day I woke up and the water was foamy, cloudy, and there was stuff all over the bottom on the rocks. I cleaned it out. That didn't work. I took the bottom off of it and cleaned that out and still nothing. Pretty disappointed because this was perfect. :(
Date published: 2016-08-08
Rated 1 out of 5 by from Terrible, not what I expected My boyfriend and I invested in this product a few months ago but boy was it a mistake. It was good at first, like the first 2 weeks and after that, a mess. It has to be cleaned so much because it just gets so dirty. It says to replace the filter with the bracket inside every month but it happens more often than that. Another thing is that it's not even silent!! Why is it called Whisper and said to be quiet when it's the loudest thing ever. The filter we had before this one was quieter and we barely liked that one.
Date published: 2016-07-20
Rated 5 out of 5 by from awsome I bought this with my first aquarium and it was awesome and it was quite and when it first starts to turn on it will make some sounds but after it is done starting it is quite and it does a great job keeping my tank clean
Date published: 2016-07-19
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What is the gph flow rate of the 10-30i?

Asked by: 77cream
Answered by: BREX
Date published: 2016-09-23

How do filters install on 10-30i

Asked by: Ziggylilly
The filter cartridge slides into the back portion at the widest spot. Depending on which version you own, your bio foam or bio scrubber would go in the front of the cartridge, facing the tank.BREX
Answered by: BREX
Date published: 2016-09-19

We have a 1.5 gallon glofish tank and the water has quit running thru the filter. The water looks like it is running into it but not coming out the spout. We bought a new pump and tubing not too long ago when we had problems. Any idea why?

Asked by: Chelle4160
Check for clogs where the white tube connects to the black filter body, you might have some debris caught in there. You could also have debris caught there the flexible vinyl tubing connects to the large white tube. Last, but definitely not least, if the airline tubing looks dark brown or black where it connects to the port on the air pump, remove it, and snip the discolored part off. This is caused by oxidation and it makes the tubing very stiff and restrictive where the discoloration occurs, reducing air flow.Also, make sure water has not backed into your pump if you are not using a check valve.BREX
Answered by: BREX
Date published: 2016-09-19

I bought one of your Whisper 10i power filters for a new ten gallon tank I set up for a single 3" to 4" Goldfish I have in the tank. Within 3 to 4 days got cloudy. Rinsed filter bag as instructed. Why is tank cloudy? NO suction cups came either.

Asked by: Larry13
Your tank is new and going through the initial stages of the nitrogen cycle. On top of that particular cause for cloudiness, you have maxed out the amount of fish the tank can hold, once it is established, right at the beginning. Third, goldfish produce copious amounts of waste and require large tanks with large filters. A 3-4 inch goldfish needs 9-12 gallons as a minimum, preferably more, to allow for its continued growth. It will reach 6-12 inches eventually; its size dependent on species of goldfish. In the meantime, you have cloudy water due to a bacterial bloom and most likely an ammonia spike. I would recommend changing 30% of the water, and adding Tetra SafeStart Plus along with your water conditioner. SafeStart Plus will help cycle the tank faster, and clear the water, within a week to two weeks. Otherwise, you will continue to have cloudy water and ammonia issues for a month or more. For more information on the nitrogen cycle, check out our FAQs. In the meantime, I will reach out directly for your information in order to send you some suction cups.BREX
Answered by: BREX
Date published: 2016-09-14

I just changed the bio bag in my tetra filter and now the unit will not work when i plug it in.....any suggestions????

Asked by: Jclark
Most likely the impeller is clogged and needs cleaning. I will email instructions to you, but you basically need to pull the motor off, open it, and remove the impeller.BREX
Answered by: BREX
Date published: 2016-09-06

Are bubbles supposed to fill the holder were the filter is

Asked by: Sand 71
Depends on which model you own, but in general, you will get some bubbles yes. If you own the Whisper 1-3i the back of the filter cartridge will be filled with bubbles, while a small waterfall comes out the front of the filter. If you are getting a lot of what looks like soap bubbles, do a partial water change, and cut back on the amount of food you are feeding.BREX
Answered by: BREX
Date published: 2016-09-06

Would you email instraction on how to clean the impeller please?

Asked by: Wiwi
That depends on which model of the internal filters you own. The Whisper 10i just requires you pull the bottom half down and off, then pull the impeller out of it for cleaning. I will email the instructions for the 20i and 40i filters.BREX
Answered by: BREX
Date published: 2016-08-29

For the Whisper 20i Internal Power Filter.I recently purchased a full hood, but the filter interferes with it being mounted. I haven't moved the filter lower to fix that because I am assuming the outflow needs to be above water. Is this true?

Asked by: DiegoF
No. You should lower the filter so the top of it is 1" or so below the top of the tank. The water level should be right at the spillway, not below it. BREX
Answered by: BREX
Date published: 2016-08-29
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Whisper Internal Filter Instruction Sheet

Whisper 3i In-Tank Filter Instruction Sheet


Aquarium Size

Cartridge Size


up to 10 gallons



up to 20 gallons



up to 40 gallons