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Tetra Whisper Bio-Bag Disposable Filter Cartridges - Large by by Tetra

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Product Description

Tetra Whisper Bio-Bag Cartridge replacements complete the Whisper Power Filter package for a clean, easy-to-maintain aquarium. Filled with ultra-activated carbon, these ready-to-use disposable filter cartridges remove waste particles, odors and discoloration for crystal clear water.

  • Genuine Whisper filter cartridge replacements
  • Keeps water crystal clear
  • Removes odors & discoloration

Bio-Bag cartridges are tough on the debris that makes aquariums nasty. Ultra-activated carbon absorbs odors and discoloration and dense, dual-sided mesh catches debris and fish waste better than other brands to keep your fish tank clean. Replace cartridges once a month for maximum filter efficiency.

Tip: Replace Bio-Bag cartridges when water begins to overflow excessively from the Wonder Tube chamber.


  • Small : Fits Whisper In-Tank Filter 3i
  • Medium: Fits Whisper Power Filters 10i, E, J, 10 & MicroFilter
  • Large (formerly Regular): Fits Whisper Power Filters 20i, 40i, C, 20, 30, 40 & 60
  • X-Large: Fits Whisper Power 4 & 5 Power Filters

Free Shipping & Easy Returns

Enjoy free saver shipping on orders over $49, even the BIG stuff. Keep what you like and send back any unused items within 30 days.

Authentic Products stands behind the authenticity of it’s products, sourced from reputable brands you can trust.

100% Satisfaction Guaranteed

We always want you to be satisfied when you shop with us. If not, contact us within 30 days for a replacement or a refund.


Zanjero, Warwick RI on 04-18-2016

Cheapest around, do not bother looking anywhere else, I have done that for you. If you don't buy them here you['re getting RIPPED off! EASY TO USE and keeps your tank nice and clean.

Jean, Grant NE on 01-29-2016
Great Filters

I have a rather heavily populated tank and use the Tetra Filter. These Bio-Bag Disposable Filter Cartridges work great, assembly is simple and keeps my water clear and the fish healthy. I've used them for years.

Charles, Woodridge IL on 11-20-2015
Great product

Filters help to keep tank clean and healthy for my fish. Love them

Randy, Grand Junction CO on 11-04-2015
Tetra Whisper Bio-Bag Filters

I was very pleased with the Filters and glad you had them.

Shawna, Twin Falls ID on 04-19-2015
Tetra Whisper Bio-Bag Disposable Filter Cartridges LRG Bulk

I bought bulk on the cartridges, Awesome Price!!! I love it that I'm able to buy like this!! Thank You!!

Charlie, Joliet IL on 03-27-2015
Great filters

I have a large fish tank and go through a lot of filters. These are great, they really work, and what a great price.

Quanxi, Savoy IL on 09-09-2014
Good products

Nice products and fast delivery.

Jan, Gainesville VA on 08-08-2014
Excellent filter cartridges

After using several other brands, I discovered the Top Fin Filter, which uses these filter cartridges. I buy them unassembled to save money, but they are also available ready to use. They are simple to assemble and it takes very little time. The filters do a great job catching even tiny particles. My water is crystal clear because of these filters.

Cr, China Spring TX on 02-13-2014
Clean Water = Happy Fish

Have used Whisper power filters for over 25 years and Pet Mountain has the lowest price on filter cartridges! And do not forget about great shipping rates and fast delivery!

Antonio, Houston TX on 06-05-2013
Great price

Great price for this 12 pack.

Moose, Coon Rapids MN on 04-19-2013
Best price around

Best price around -- can't be beat!

Coca, Astoria NE on 12-25-2012

I order my filters through Pet Mountain all the time. Price, quality and service can't be beaten.

Cr, China Spring TX on 08-21-2012
Great Value!!

I have been an aquarium hobbiest for over 35 years and have used Whiper filters and Bio-Bags for the last 25 years. The quality has remained the same, easy to assemble, crystal clear tanks and happy fish! You can not beat the price of Bio-Bags from Pet Mountain!

Josh, Valley City OH on 03-15-2012
Soo great deal

Such a Great deal, can't find a better price anywhere, I've been buying from ebay and thought I was getting a deal there, not as great of a deal as this store.

Larry, Everett WA on 12-28-2011
Great Value

My business is buying and selling fish, aquariums and accessories. I have 40+ aquariums set up and I use mostly the same type filters on these aquariums, so I can use the same cartridge replacements. These Whisper Cartridges are easy to change, can be cleaned 2-3 times, allow me to add any type of media (charcoal, ammonia remover, crushed coral for pH control and anything else I desire) and can be used in both fresh and salt water. It is a great value to buy these in this bulk quantity

George, San Angelo TX on 12-16-2011
Economical Purchase

The Bio Bags at this quantity is a good buy for the money. All the makings are included to refresh your filter when needed for this low price.

Kris, Buffalo NY on 12-15-2011
Easy to assemble.

I was happy that these bags were easy to assemble and work great.

Michael, Warner Robins GA on 07-02-2011
Only place I buy them

I havent seen anyone that beats the price for these. So I always order mine here, you should too. They always arrive quickly and packed good.

Rick, Port Allegany PA on 03-15-2011
Elmo is happy now!

I have been using these filters in our 25 year old Eastern Painted turtle's residence for many years and they work quite well. We live in a remote area of northern PA and reasonably priced supplies of most anything are hard to get. I was overjoyed to find this supplier.

Christina, Keno OR on 01-13-2011

These were the best priced filters I could find online. They work with my whisper power filter 40. They work great!

Bill, Athens GA on 12-01-2010
Best Price

Best price known versus local dealers. Free shipping, although long, was worth it.

Vicki, Sarona WI on 11-26-2010
Good as Usual

This product has always been my favorite to use. They last quite a while if cleaned regularly.

Amy , Brook Park OH on 10-28-2010

I love that they are shipped right to your door!

Kenny, Thiells NY on 10-11-2010
we love the efficiency of this cartrige

We recommend the this cartridge as replacement filters and its efficiencies and more importantly the pricing.

Jain, Monroe NJ on 10-04-2010
we love this product

We have a big fish tank with some big Koi and gold fish. Since 5 yrs we use this filter cartridges and it works very well and keep the water clear.

Larry, Everett WA on 09-16-2010
Great Price!

About half the price the pet store wants. I just wish they would make a product that can be reused more than a couple of times. After cleaning these filter bags once, they fall apart on the second cleaning. I use these type filter bags for nearly all of my 45 tanks.

Tricia, Salinas CA on 07-31-2010
Good Price

I have been using these filters in my fish tank for many years. At present, I have gold fish that are about 3 years old. The filtering system works well. The bio-bags need to be changed every two weeks, which can be expensive. The price I paid at Petmountain was the cheapest I have found.

Nancy, Chalfant Valley CA on 07-26-2010
super fast delivery

great price, easy to use, fast delivery. I will definitely order again.

Peter, San Gabriel CA on 07-17-2010
Easiest to Change

I have been using the Tetra Whisper Bio-Bags for decades. It is very convenient to change and very effective in filtering water debris. The water is maintained crystal clear. The bags can be used twice. I rinse the bags once and change out the old charcoal with new.

Dave, Saint Louis MO on 06-10-2010
Happy With Purchase

I was very happy to find this 1-Pack available as they are rather expensive in my local pet store which only sells them individually. The item I received is exactly what I expected.

Matt, Charleston WV on 04-01-2010
Great Buy

Exactly the same quality product I can buy here, but for much less $$$ ! Color me happy!

Ian, Brooklyn NY on 02-18-2010
Used it for years

I've been using this product for years and it works really well. Maybe too well because it traps so much stuff I have to replace every 3 weeks at least.

Teresa, Portland OR on 02-02-2010
Found a GREAT Source!

The trend seems to be going to the all-in-one filters, which are very convenient, but not as effective and as durable as the Bio-bag filters. Thank you Pet Mountain for having them and shipping them so quickly! You are now "My Source" for filters!

Glenn, Clinton MD on 01-17-2010
Very good purchase

I had no problems ordering from this company. I would definitely order more from Pet Mountain.. Great job!

Paul, Boise ID on 01-02-2010
Great product as expected!

I'll continue ordering products like the Bio-Bag disposable filter cartridges from Pet Mountain. Pet Mountain offers this and other products that I ordered at a fair price. I bulked up my order a bit with things that I needed, and Pet Mountain waived the shipping charge! All items were received as expected in excellent condition.

Lynda, Rocky Point NY on 09-25-2009

The filters we ordered are great for our goldfish tank. We have used them for the past 4 years and have no complaints. Thank you.

Pat, Branford CT on 09-29-2007
great price

1/2 price of walmart, you guys rock

Matt, Saint Albans WV on 08-20-2007
Easy to assemble, gets the job done

Assembling these filters is very simple, takes less than 5 minutes to assemble two cartridges. These cartridges work wonderfully to keep water crystal clear.

Andreas, Florence SC on 07-10-2007
These are the best

I really like these filters; they work well and are more reasonable than others, especially the unassembled ones. I would recommend these to anyone

Abilene, Tx TX on 03-08-2007
Fresh water simplified

I have a community tank, adding a variety of food. Flakes, pellets and granuales. The bio-bag, keeps excess food out of the cycle so there is no build up of nitrates. Plus, the carbon helps the water stay crystal clear. Thanks TETRA.

Chuck, Dewitt NY on 01-11-2007
Ease of Use and Superb Performance

The Bio Bag Cartridges by Tetra provide one aerobic frame, Thick N' Fluffy filter bags and activated carbon in pre-measured vacuum sealed envelopes. All that you need to do is to slip the filter bag over the frame, open the carbon envelopes, place the carbon in the filter bag, clip on the top to the frame to seal the filter bag, rinse under cold water and insert into the Tetra filter. The filter goes a great job keeping aquarium water crystal clear. This could well be a messy job, but with the Bio Bag Filter Cartiridges it is a breeze. You are able to keep your aquarium looking great and you have none of the mess that typically goes along with using carbon as a filter medium.

Celia, Doral FL on 01-06-2007
My Turtle's House is cleaner than ever!!!

This filter is economic and the cartridges last a long time. Plus my turtle is happy to have crystal clear water thanks to all the waste getting trapped in the filter cartridge!!

Tom, Clio MI on 12-04-2006
Cheap and Easy

Overall I am very pleased with this easy to use and cheap filter packs. I have two Whisper 60s on my 120 and they keep it clean even with 30 good size cichlids in it.

Tom, Clio MI on 12-04-2006
Great Filter, Great Price

Cheap and easy to use, what more could you ask for. I have 5 tanks running with these filters!

Ira, Baldwin NY on 11-09-2006
Whisper Bio Bag

Great product, change filter media with no muss or fuss and in under 5 minutes. I have 2 of these filters.