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Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump

4.3 4.3 out of 5 stars 19,763 ratings

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Up to 30-Gallons

Purchase options and add-ons

  • UNIVERSAL DESIGN: Tetra Whisper 20i Internal Filter is an all-in-one air pump and water filter system.
  • INTERNAL FILTER: Mounts on the inside of your aquarium with clip (included).
  • CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste.
  • AERATES WATER: Air-driven design filters up to 125 GPH while oxygenating water.
  • CONVENIENT DESIGN: Uses large easy to change Bio-Bag cartridges; filter mounts inside aquarium, making it possible to place tank flush against the wall.

Customer ratings by feature

Easy to clean
4.1 4.1
Noise level
4.0 4.0
Suction power
3.9 3.9
Sheerness
3.9 3.9

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Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump
Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump
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Price-38% $14.46
Typical:$23.45
-38% $5.99
List:$9.59
$5.85-5% $39.99
List:$41.99
$24.99$37.99
Delivery
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Customer Ratings
Easy to clean
4.1
4.3
4.1
4.0
4.0
Noise level
4.0
5.0
4.3
4.4
Suction power
3.9
5.0
3.8
4.1
Value for money
4.5
4.4
4.3
3.9
Sold By
Amazon.com
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Amazon.com
Fairyna
Yaubay
Atlantis Aqua

From the manufacturer

About Us

Tetra’s tradition of innovation started more than 50 years ago in Melle, Germany, where Dr. Ulrich Baensch founded the company (Tetra Werke) and pioneered the development of flake fish food - an innovation that revolutionized the industry. At the time, growing and harvesting food for your fish was a painstaking process. The advent of flake fish food not only made feeding your pet much easier. It opened the way for more people to own an aquarium. At Tetra, we’re dedicated to helping seasoned hobbyists and beginners alike enjoy a successful, life-long aquatic experience.

Product guides and documents

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 4.88 x 5.38 x 10.19 inches; 1.45 Pounds
  • Item model number ‏ : ‎ 25817
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ June 9, 2004
  • Manufacturer ‏ : ‎ Tetra
  • ASIN ‏ : ‎ B0002DHYG8
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.3 4.3 out of 5 stars 19,763 ratings

Looking for specific info?

Product Description

For the ultimate in convenience and quiet, choose a Whisper In-Tank Filter. These filters mount on the inside of the aquarium, rather than hanging from the outside -- making it possible to place the tank flush against a wall. In-Tank Filters are unusually quiet, since the motor is under the water. Offering the same quality and performance as an external filter, the Whisper In-Tank Filter will function in as little as 2 inches of water -- making it ideal for turtle tanks, or for creating a waterfall inside the tank.The Whisper In-Tank filter features adjusts easily to high or low water levels with mounting suction cups and/or bracket. Each filter comes with one pre-assembled Whisper Bio-Bag filter cartridge.

Important information

Directions

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Customer reviews

4.3 out of 5 stars
4.3 out of 5
19,763 global ratings

Customers say

Customers like the noise level, cleanability, and value of the filter. For example, they mention it's extremely quiet, easy to clean, and useful for keeping the fish tank clean. That said, opinions are mixed on quality, performance, size, and clarity.

AI-generated from the text of customer reviews

897 customers mention637 positive260 negative

Customers like the noise level of the pet supplies. They mention that it is extremely quiet and the sound is a non-issue.

"...All four of them are not quite silent, but very quiet. There is a soft, low hum from the motor windings, a little bit like a transformer humming...." Read more

"...I use this in both of my betta fish tanks with no issues at all. Extremely quiet, especially considering one fish tank is right next to my bed on..." Read more

"...It does have some noise. I would not put it in a place where you will sleep but it does work. I have it in the fish tank at the office...." Read more

"...Sound is simply a non-issue. The guppies reproduce rapidly and their small fry have been safe. None have been drawn in by the filter's intake...." Read more

461 customers mention378 positive83 negative

Customers like the cleanability of the filter. They say it's easy to clean, and very useful for keeping the fish tank clean. Customers are also surprised with the cleaning performance, saying it'll clear the water nicely overnight. They mention that the filters are cheap and can be reused by washing with water.

"...I got the 10-30 filter, and it keeps my 40-gal tank clean. I clean it every1-2 weeks...." Read more

"Turtles create huge messes and this filter does an amazing job of keeping the water clean." Read more

"...filter size, my water now almost filled to the top, stays absolutely clean...." Read more

"...-They are both still easy to clean-They circulate water nicely at the surface..." Read more

362 customers mention297 positive65 negative

Customers like the value of the filter. They mention that it does a remarkable job for its price, is quiet, and can find replacement filters at good prices. Some mention that the filter itself is cheap and the filter part seems decent.

"...better than the filter cartridges for Marineland products and cost much less to buy...." Read more

"Price was most reasonable. I even ordered a second filter." Read more

"...the market for a new pump/filter...especially with how inexpensive the bulk filters cost. 12 filters for something like $8/year?! That's a steal." Read more

"...And the price is really Affordable." Read more

198 customers mention172 positive26 negative

Customers like the ease of setup of the filter. They mention it's simple as can be, easy to use, and assembled in a snap. Some appreciate the fact that it doesn't need priming. Overall, most are happy with their purchase and recommend it to others.

"...No priming necessary ever, including after a power failure. When the power comes back on, it just starts working again...." Read more

"...I like to keep it hanging from the tank. Makes it easier for me to access it." Read more

"...Such a simple device, yet so beautifully sufficient...." Read more

"...Even though I had to replace the cartridges often, it was easy to do so since all you do is lift them up without removing anything else...." Read more

1,097 customers mention636 positive461 negative

Customers are mixed about the quality of the pet supplies. Some mention that it's perfect, quiet, and slim, while others say that it was way too strong, suspect in quality, and flimsy.

"...On a benefit/cost basis, these filters look really good. They are made of a tough, slightly flexible plastic, so even if you drop one on the floor,..." Read more

"...That's right, this thing was USED! FILTER #3 - STINKY, NOISY, USED GARBAGE..." Read more

"...It's quiet enough where you can ignore it. It did not have any broken or missing pieces. I got the 10-30 filter, and it keeps my 40-gal tank clean...." Read more

"...(perfect for bettas), cheap, has worked fine with sand.Cons: None...." Read more

995 customers mention685 positive310 negative

Customers are mixed about the performance of the filter. Some mention that it works fairly well, while others say that it never worked very well. Some say that the hook does not work with tank lids and the suction cups are weak.

"...And the results are as good as any other filter I've ever used, regardless of cost...." Read more

"Filter works great. Had to replace the previous filter I had that was also a Tetra Whisper filter, my fault it broke down. It does have some noise...." Read more

"...My 20i still works but my 40i just stopped working after only three months of use. That's terrible! It works really well when it's not broken though...." Read more

"...The 10i works perfectly in a 3 gallon tank, which I have two of and I have a 10i filter in each...." Read more

273 customers mention109 positive164 negative

Customers are mixed about the size of the filter. Some mention that it's the perfect size to fit the tank lid and takes up very little space, while others say that it’s a bit large for a 6 gallon tank and a little too big for ten gallon tanks.

"...surface movement for some fish, still louder than the 10i, looks large in my 46 gallon...." Read more

"...The standard tank top fits nicely without interference with the filter...." Read more

"...One thing I'll say is there is quite a bit of unused empty space...." Read more

"...It’s great for shallow water for turtles and frogs and such, as well as deeper water and fish...." Read more

210 customers mention133 positive77 negative

Customers are mixed about the clarity of the filter. Some mention that it has the water crystal clear, while others say that it made the water murky. The waterfall feature splashes the water just right, and the filter is quiet. However, some customers report issues with water seeping through the cord and flooding their counter.

"...The water in my tank using this little filter has been crystal clear...." Read more

"...be a crack in the tank but then I realized it was actually water seeping through the cord of this filter and dripping onto the ground!!..." Read more

"Runs quiet and keeps water clear." Read more

"...After 12 hours (yes only 12!) the water was crystal clear! The smell was gone and the fish - amazingly - seemed....happier?..." Read more

How can something so simple work so well?
5 Stars
How can something so simple work so well?
When you open the box, the Whisper 40i (or it's smaller siblings) don't seem very impressive. It's not much more than a oval plastic bucket, with another bucket (containing a motor and pump) snapped onto the bottom. If you looked at one and thought "this can't possibly work", you would be so wrong.Perhaps they work as well as they do BECAUSE they are so simple, and so have little chance for things to break. The pump sits IN your aquarium water, so it never needs to be primed. You plug it in, and it begins working, filling the upper bucket, where the water flows through the filter pad and spills back into the aquarium. No priming necessary ever, including after a power failure. When the power comes back on, it just starts working again. It's a shame that every hang-on-the back power filter can't make a similar claim, some unfortunately will lose their prime and/or fail to restart, resulting in unhappy fish and sometimes a damaged filter.There are no adjustments for flow, so these only run at one flow rate. Inevitably, some food can get sucked up if you let it run while feeding. I have the filters on a separate power strip, so when I feed my fish, I just use the switch on the power strip to turn the filters off for an hour or so. Easy solution and prevents the filter pads from clogging so quickly.There is no top or lid (unless you buy the model intended for reptiles), so the filter pads just sit there exposed. This means that the water in the filter is fully aerated as it passes through the pads. It also means that no other internal filter is as easy to change pads when they become clogged. The top edge of the pad is above the water line, so you just grab it with two fingers and lift it out. You don't have to disturb the suction cups or hanging bracket at all. You don't have to put your whole arm down into the tank. Maintenance which is easily performed is more likely to be done when needed, so easily changed pads are more likely to be changed when clogged.You have options for how you want to attach the filter. The box includes two suction cups, and a newly designed bracket which hangs over the edge of your tank. I use the bracket, as it's adjustable for height and I don't have to worry about suction cups losing their suction.The filter pads are the Whisper bio-bags, which amount to a thick fluffy poly bag, over a plastic frame, with carbon granules inside. Replacing these is simple, and if purchased in a 12 pack from Amazon, cost about 60 cents per bag.I used Emperor filters for years, and in my experience, these bio-bags work a lot better than the filter cartridges for Marineland products and cost much less to buy. If you rinse them under tap water, which is easily done, the cost is even less. Rinsing the bags doesn't disturb your biological bacteria since they are on a separate part (resembling a hair brush) which remains in the filter when you remove the bags.You do have some flexibility with regard to media options as well. You don't have to use the carbon which is included with the new pads. You can put anything you want inside the bag, and if desired, transfer it to the new bag next time you change them out. You also don't have to use the separate biological "hairbrush", and if you leave it out, you have room to put another media bag in it's place, with ceramic rings, or whatever else you can think of.I have four of these, mounted on two separate tanks, one 55 gallons, the other 75 gallons. All four of them are not quite silent, but very quiet. There is a soft, low hum from the motor windings, a little bit like a transformer humming. At first there was also a faint sound like air trapped somewhere, perhaps cavitation in the pump? But these sounds are hard to hear, and not distracting. And the cavitation sound went away on it's own after a few days. I can hear the soft humming sound if the room is totally quiet and I stand near the tank, but if there is any significant sound from conversation, crunching breakfast cereal, a radio or TV, etc, then they are drowned out.Some of the complaints others have mentioned in their reviews sound a bit like operator error to me. For example, one person said the filter overflowed and sent water over the back of the tank onto the floor. Clearly, the filter was mounted too high....mine are mounted with the top edge 2 inches below the rim of the tank. When the filter pad becomes clogged, it WILL overflow, but into the tank, not out of it.Some describe loud mechanical noises, which sounds to me like a bit of gravel, or perhaps a snail, found it's way into the pump impeller. Yes, this can happen with any filter, regardless of brand, but it's easy to repair. In these filters, the bottom just snaps off, exposing the pump impeller, which is then easily removed for cleaning.And some have complained that the filter "stops working" after some months of service. Again, this is likely due to a need for a cleaning of the impeller and the recess where it sits, where debris or gunk sometimes builds up and prevents it from rotating.On a benefit/cost basis, these filters look really good. They are made of a tough, slightly flexible plastic, so even if you drop one on the floor, it is unlikely to break. Parts for Tetra/Whisper filters are readily available everywhere. And the results are as good as any other filter I've ever used, regardless of cost.The first attached photo shows two mounted in my 75 gallon planted tank, which contains two Nigerian bichers, and two Pictus catfish. The second shows two more in my 55 gallon community tank, with various tetras, cory catfish, and loaches.
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Top reviews from the United States

Reviewed in the United States on February 7, 2024
Size: Up to 30-GallonsVerified Purchase
Reviewed in the United States on September 29, 2023
Size: Up to 10-GallonsVerified Purchase
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Reviewed in the United States on October 28, 2020
Size: up to 4-gallonsVerified Purchase
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4.0 out of 5 stars Love the filter, but not completely.
Reviewed in the United States on October 28, 2020
I used to have a Tetra Whisper filter for my 3 gallon tank, but after my betta fish died, I decided to quit the fish-keeping thing and threw away or gave away almost all my aquarium stuff, including the filter (except for the tank itself). But, since the lockdown due to the pandemic, and being stuck in the study room doing classes virtually all day, I decided to get a fish again for my desk. So I obviously wanted the same filter that was in my aquarium before, but couldn't find it anywhere (it was exactly like this one, except it had a long tube at the bottom, and another airline tube that connected to an air pump outside of my tank). So I thought this one was close enough and used the exact same cartridges as my old Tetra Whisper filter.

But what I thought were just small differences between the two, made a huge difference. First, I LOVED that there weren't any airline tubes that connects to outside air pump, leaving my desk less cluttered. I also liked the way the water fell- in three pretty streams. And most of all, I LOVE how quiet it is! My old filter (because it was attached to the air pump) made so much noise, sometimes it would give me headaches, but this one is super silent.

BUT there is ONE small difference that makes a huge difference- there isn't a "safety guard" at the bottom by the intake area. As many reviewers mentioned, especially those who bought the 4 gallon filter, the filter's intake can kill fish, especially betta fish. If a small part of it's long fin gets caught in the filter intake, the entire fish becomes over powered and gets killed. So, according to Tetra, to avoid this, you have to put a panty hose around the intake. I, thought, okay no big deal, awesome filter, will just put a panty hose around it. So it I did. As soon as i did, the filter's flow slowed down. Didnt think too much of it until I went to clean out my aquarium today, it was so slimy everywhere! My old aquarium never had a problem with things being slimy, ever. Mind you, my new fish has only been in it for a week. When I checked the filter, the panty hose became full of yuck. Basically, the panty hose prevented the dirty water from going through the filter and instead acted as a filter itself KEEPING the dirty things IN the aquarium and preventing from going through the filter. But the panty hose isn't Tetras problem right? But it is. They made a filter that can kill fish, and state that the only way to avoid their product from killing fish is to put pantyhose over it- which stops the filter from working properly. Why couldn't they add a mesh/guard by the intake to BEGIN with? Their old model had one, why did they forget such a vital part?

I included photos of the old Tetra Whisper Filter and the new Tetra Whisper Filter.

***UPDATE (One year later- September 2021):****
I wanted to update this review after solving the issue with the pantyhose situation. Instead of putting a pantyhose, I cut a small piece off of my old mosquito net bed canopy and put that over the filter. And THAT helped so much. No more slime, as the water is able to go through the filter and the net is thick enough to prevent my betta from getting his fins stuck. Also, I'd like to mention that my fish, as it grew older, realized the area around my filter is potentially dangerous and has a strong current, so he doesn't go around there. But obviously, every fish is different. I still love this filter, super quiet and not at all clunky like my old one.
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71 people found this helpful
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Top reviews from other countries

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Amazon Customer
5.0 out of 5 stars perfect for small tank
Reviewed in Canada on September 8, 2023
Size: Up to 10-GallonsVerified Purchase
Jean d.
5.0 out of 5 stars Excelente
Reviewed in Mexico on July 10, 2023
Size: Up to 10-GallonsVerified Purchase
S Ravello
5.0 out of 5 stars Great filter, very quiet.
Reviewed in Canada on May 15, 2023
Size: Up to 40-GallonsVerified Purchase
MEC Bill
5.0 out of 5 stars Quiet Filter
Reviewed in Canada on April 7, 2023
Size: up to 4-gallonsVerified Purchase
One person found this helpful
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Stranger
1.0 out of 5 stars Broken the next day
Reviewed in the United Kingdom on July 6, 2023
Size: Up to 10-GallonsVerified Purchase