Whisper® Internal Aquarium Power Filters

Product No. 25816-01


Find a Store In Stock
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. NOTE: The filter now comes with a clip to hold the filter. If suction cups are needed please contact Consumer Services at 1-800-322-1266.
Whisper® Internal Aquarium Power Filters is rated 3.1 out of 5 by 61.
Rated 2 out of 5 by from Problem Ive replaced my whisper twice within two months. And I came home again to my tank not getting filtered. Dont think ill be buying another tetra whisper.
Date published: 2017-03-10
Rated 1 out of 5 by from Loud and noisy I purchased this a few days ago and since day 1 it has been making a terrible grinding noise! It is extremely irritating since my last Tetra Filter started doing this in just a few months of use. I will be returning it ASAP.
Date published: 2017-02-15
Rated 2 out of 5 by from Works as described. It is quiet as it says. Cannot use the clip provided. Doesn't allow for the hood/light to sit properly on the top of the tank. Using 2nd suction cup instead of the clip, just had to drop level of water a bit more than I like. Instructions were a little vague on how the filter and the scrubber are inserted but I think they are in correctly. Been running for a few hours now and the water is already crossing over the top of the filter cartridge. That shouldn't be happening already especially being new. Other the few problems, it works as described. Why I give it a Fair rating.
Date published: 2017-02-12
Rated 1 out of 5 by from Bad design. There is a basic design flaw in the Whisper 10i. Not all the water pushes to the front and if one is not careful water will run out and over the clip that holds the filter in place. The water runs over the clip and onto the floor. I have 3 of the filters and at one time or another each of them has overflowed over the clip. I will look for a better filter for a small tank.
Date published: 2017-02-10
Rated 1 out of 5 by from Terrible The filter stopped working and I was unaware of it. I came home my house was full of smoke. All of my fish were dead.
Date published: 2017-01-24
Rated 3 out of 5 by from This filler and my betta I just bought the whisper 10i filter and I like it so far I set it up and it is working well but the water current is a little to strong for my veil betta fish and he is having a hard time finding somewhere to rest being I don't have much things for him rest on but I guess with this new filter I will have to get more
Date published: 2017-01-12
Rated 5 out of 5 by from Great filter My tank is nice and clean now.I bought mine at a store not on here. Mine only came with the filter. I didn't get the scrubber thing with mine.
Date published: 2017-01-11
Rated 4 out of 5 by from set up not quite obvious, information missing I just bought a Whisperquiet 20i unit and it seems to be working nicely. However it wasn't quite obvious how to set it up. I know there are only 2 parts but the plastic piece fits nicely into the slot which seems to be for the filter. To make it even odder there are two indents near the inside front that fits the plastic part but doesn't hold it in place. Ignoring those oddities and putting the filter into the rear slots and letting the plastic part sit loose seems to be correct but a clearer diagram would have avoided the issue. Nonetheless the unit did a fine job cleaning my tank once it started.
Date published: 2017-01-07
  • y_2017, m_4, d_22, h_4
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_61
  • loc_en_US, sid_25816, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_tetrafish

I need to remove the bottom where the pump is. How do I do it?

Asked by: Kiff
If you have the 20 or 40 Internal Filter, take a Phillips screwdriver and remove the screws from the bottom cover. If it is a 10i, the bottom simply pulls off. BREX
Answered by: BREX
Date published: 2017-04-18

How many gallons does the Whisper 2-10i curculates in an hour?

Asked by: Robin12416
90 gph. BREX
Answered by: BREX
Date published: 2017-04-12

Does it produce oxygen for the fish to breath? 

Asked by: Ethon111
Yes, just by moving the water, all filters create oxygen in the water. They do not breathe like us, they utilize oxygen through osmosis. BREX
Answered by: BREX
Date published: 2017-04-11

Hi, can I order a replacement black filter cylinder and tubing for the Tetra 1-3 gal aquarium? On this site I located the exact kind but not this size. Do they still have the top/lid? The pump does not need to be replaced.

Asked by: G CKnabe
The Whisper 1-3i is still very much available, but it only comes as a complete set, with pump. We do not sell direct, so you would need to visit a local pet or fish store to purchase it. Yes, they still have the lid. To find a store in your area, scroll down on any page on our site, and click the Buying Options tab, then Dealer Locator, and enter your zip code. BREX
Answered by: BREX
Date published: 2017-04-10

My filter worked yesterday but I cleaned the tank and the water is not flowing out .Its glub-glubbing up and down in the filter

Asked by: Bib333
Make sure the water level is to the spillway of the filter, and if it is, then unplug the unit, take it out, and pour out the water. Take the bottom half off to remove the impeller. If you have the 10 gallon size, once you pop the bottom off, you can pull the impeller out to clean it, and swab out the motor. If you have one of the larger models, you will need to remove the bottom cover with a Phillips screwdriver, then take the motor out, press in on the bottom of it, and pull towards the front of the motor at the same time. This removes the motor cover, and allows access to the tear drop shaped cover over the impeller. Once this is removed, pull the impeller out, clean it, and swab out the inside of the motor with a q tip. Please let us know if you need any other assistance. 1-800-526-0650. BREX
Answered by: BREX
Date published: 2017-04-07

Does the motor go in the water

Asked by: tippy
Yes, it does, indeed. BREX
Answered by: BREX
Date published: 2017-04-06

Does this filter suppose to give off fog like smoke in the tank? I've already lost 2 glo fish.

Asked by: Teneal
No, this filter has no way of giving off any type of fog or cloud. You are most likely experiencing either an ammonia spike and/or bacterial bloom. Test your water for ammonia and nitrite or have a fish store test it for you if you do not have a kit. Change 1/3 of the water, and replace it with clean water, AquaSafe Plus and SafeStart Plus. BREX
Answered by: BREX
Date published: 2017-04-05

I haven't had any major issues with my Tetra-Whisper 2-10 (Internal Power Filter) till today, as I am a Special Education Teacher. The suction area of the filter pulled a fish into over the weekend. Any idea how to rectify this?

Asked by: Briant419
This will only occur when there is an issue within the tank such as poor water quality or disease. The fish will be stressed or dying, and no longer able to swim, so as it dies, it becomes attached to the filter. We would recommend testing the water for ammonia, nitrite, pH, nitrate, and alkalinity, do a partial water change with a gravel vacuum of 25%, and observe all of the remaining fish for odd behavior such as rubbing against objects, listlessness or lack of appetite. Also look for white spots, torn or clamped fins, cloudy eyes, bloody spots. If you observe any of these, you may have a disease occurring in the tank. BREX
Answered by: BREX
Date published: 2017-04-04
  • y_2017, m_4, d_22, h_8CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_137
  • loc_en_US, sid_25816, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_tetrafish
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