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 3.1316 out of 5 by 38.
Rated 2 out of 5 by from Only works half the time. After two months of use, both of my whisper filters don't work like they should. I clean them regularly and change out the filter as directed but there is little to no water flow out of them right after I clean them or after about a week.
Date published: 2016-06-12
Rated 1 out of 5 by from I cannot attach whisper 3i to my tank..... I think that Tetra Whisper filters are amazing products… However the new innovative clip attachment method falls short of the functionality of the simple suction cups. Because of this, The filter I bought is completely and utterly useless, because I cannot attach it to my tank properly. Instead of flowing properly and filtering in my tank it sits there and bubbles because of the angle at which it sits. Thanks Tetra...
Date published: 2016-05-08
Rated 1 out of 5 by from Really loud and bad Bought a whisper 60 gal filter really loud and it's only been 2 weeks and it's faulty really bad I'm disappointed would like for them to resolve this
Date published: 2016-05-05
Rated 5 out of 5 by from Great filter for the money This filter performs just as well as its more expensive counterparts. It is quiet and provides biological filtration. The filters are easy to change and can be found in most places that sell aquarium supplies.
Date published: 2016-04-06
Rated 1 out of 5 by from Tetra I3 - New design sucks! Tetra I3 which has ALWAYS had suction cups. This new one won't work with my tank now. The clip makes it sit diagonally. Wasted money!
Date published: 2016-03-30
Rated 1 out of 5 by from Terrible The rate of flow is too high for it's own filters. After 2 days the water just runs up and over the filter media. Since the rate of flow is not adjustable, you have no real filtration happening. Even a brand new filter only lasts a day or 2. Definitely should have been built with an adjustable intake.
Date published: 2016-03-23
Rated 5 out of 5 by from Great Product I have a 60 gal tank which I use for turtles I the winter time. I have 2 filters on a 60 gallon tank which I keep 1/3 full. Keeps the water clean even with the 3o feeder fish I start out the winter with. It's quite easy to change bio bags and clean both filters in less than 30 minutes. I had a problem (customer caused) with one of the filter I had bought 3-4 years ago, and called Tetra for a replacement part. They advised the part was not available but dent me a new filter fee of charge. That is great customer service. Thanks!!!.
Date published: 2016-01-25
Rated 4 out of 5 by from sand might halt filter If you use sand in your tank might have to do more matinance. Sometime sand night get stuck in the filter, if you pull the filter apart and pull the fan out you need to clean the sand out of that and it should work fine. The manual doesn't tell you this, I had to figure it out on my own, otherwise it's is a great filter for a crab tank since you can't use external filters for them (darn escape artists)
Date published: 2016-01-03
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This is the one My Grandson has. Is it supposed to have a wire to filter in the water? The set up was attached to the tank??

Asked by: Cathyfish3
If your son has a small 1.5 gallon tank with a filter like this, then yes, there is a wire that attaches the filter to the tank. This filter, sold by itself, has a wire that is not attached to the tank, but does go into the water.BREX
Answered by: BREX
Date published: 2016-06-24

I replaced a 10i with a new 40i in a 10 gal tank for a S. snake neck hatchling (soon moving it to a 30 g.). Water level at about half so the filter is sitting inside on floor not hanging. The 40i is humming very loud, my 10i didn't make any noise? 

Asked by: travlnman
First, you should use the suction cups to attach it to the wall, so it is not resting on the floor. This is more powerful, so I'm sure it is vibrating against the glass.BREX
Answered by: BREX
Date published: 2016-06-17

Hi, I have a submersible filter for my 30 gallon tank and I wanted to know if you sold the plastic grid rectangle thing the filter bag and carbon goes over to hold it up straight when you put it in the filter. 

Asked by: Willomoto
If you are referring to the plastic frame that is inserted into a replacement filter cartridge, no, those are not sold separately, they only come with a new bag.BREX
Answered by: BREX
Date published: 2016-06-13

I have a 10 gallon tank with 2 small turtles will the Whisper 10i be able to keep the water clean, or do I need to get a filter for turtles like the reptile 10

Asked by: Kimba
You need a larger tank. It is recommended to use nothing less than a 20 long tank for a baby turtle, and you have two small turtles. The Whisper 10i and the Reptofilter 90 gph are the same thing, one is black and one is green, but that is the only difference. You need a larger tank to begin with, and then with having two turtles, I would recommend a Whisper 40i for now. As they grow, you will eventually need a very large tank with a canister filter, depending on the species of turtle you own. They live 40 years, and if they are sliders, grow to between 8" and 12", requiring tanks of 100+ gallons. I house an 8" painted turtle in a 90 gallons, and just rescued a 9-10 inch river/pond cooter that is going to get to 16". She is in need of a permanent home, which is not easy to come by. For more information, visit www.turtlerescues.com. There are lots of information sheets, ideas for set ups, and a gallery.BREX
Answered by: BREX
Date published: 2016-06-13

What is the largest whisper internal filter made

Asked by: Waniac
The Whisper 40i.BREX
Answered by: BREX
Date published: 2016-05-25

I have 2 underwater whisper filters in my 55 gal tank  both  have lids  and are great.1 has stopped I cant find any that are the same??? The closest I could find is a 20-40 no lid ..The lid from my own  fits pretty well .Question is ,,Can I submerge it ?

Asked by: kita
If you have not taken the motor apart yet, that may be all that your old one needs done. I suspect the impeller needs cleaning. Remove the two screws with a Phillips screwdriver to take the cover off. Disconnect the motor, then slide the bottom piece off, pull out the impeller, and clean it, and the inside of the motor.We do not make a version with a lid that is sold separately. Yours came with the tank when you bought it as a kit The Whisper 40i is the one you would need as a replacement. I have run one in a tank, submerged and it worked well for me, but it is recommended to have the water level at the spillway and the filter should be about an inch or so below the top frame of the tank.BREX
Answered by: BREX
Date published: 2016-05-22

I have a tetra 3i, how do I get a bio scrubber?

Asked by: wildfire1151986
The Whisper 3i does not come with a bio scrubber, it only utilizes a Whisper Bio Bag, Small.BREX
Answered by: BREX
Date published: 2016-05-19

Why is my whisper 10i power filter humming?

Just recently cleaned and did water change on my 5 gallon fish tank as well as my Whisper 10I and now it's humming. I have had the tank for just over a year and it has never done this. I cleaned the filter housing and bio scrubber and just replaced with new bio bag. Took the bottom off of the filter housing and pulled the impeller out of the housing and scrubbed the impeller and the housing. Put it all back together and it's still humming. I can't get the noise to go away. It's driving me and my fish nuts!!!!!!
Asked by: couchpotato06
Buzzing is usually a voltage issue, so if you have it plugged straight into an outlet, plug it into a power strip instead.BREX
Answered by: BREX
Date published: 2016-04-27
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Whisper Internal Filter Instruction Sheet


Aquarium Size

Cartridge Size


up to 10 gallons



up to 20 gallons



up to 40 gallons