Tetra Whisper Bio-Bags Small Filter Cartridge

By Tetra
Rated 4.5238 out of 5 stars
$2.65Chewy Price
$3.99Chewy Price
$2.52Autoship Price
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In Stock
FREE 1-3 day delivery on first-time orders over $35

About This Item


  • Designed to help keep your aquarium crystal clear.
  • Ultra-activated carbon works to absorb discoloration and odors, keeping your fish tank in tip-top condition.
  • Pre-assembled Bio-Bags are ready to use right out of the box.
  • Double-sided mesh is dense to trap fish waste and debris.
  • Disposable Bio-Bags are compatible with Tetra's Whisper PF10 and 3i Power Filters (not included).

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Compatible Products

Keep your system running smoothly with Tetra filters.

Frequently Bought Together

Tetra Whisper Aquarium Internal Filter, Black, 4-gal
Rated 2.6667 out of 5 stars
$9.99Chewy Price
Tetra Whisper Aquarium Power Filter, 5-10 gal
Rated 2.7556 out of 5 stars
$14.98Chewy Price
Total Price: $27.62

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MaterialSynthetic Fabric, MeshSynthetic Fabric, MeshSynthetic Fabric, MeshPlasticSynthetic Fabric, Mesh

Questions & Answers

10 Customer Questions

do you put the cotton side in front or back (there is a plastic back).. i didn't know if it mattered? thank you
Answer by ChewyNov 03, 2017
The cotton should be on the front side of the filter, that way it catches any bacteria that may be in the tank.

Is this filter slightly smaller at the bottom? 2.16 at top and 1.78 at bottom and 3.68 tall.
Answer by ChewyOct 06, 2018
The overall dimensions are 3.8 inches tall x 2.1 inches across at its longest point. The images do shows that the cartridge narrows a bit towards the bottom.

Do I need to turn off my filter system to just change the filter?
Answer by ChewyApr 23, 2018
We'd recommend unplugging the filter when changing the filter cartridge.

Will these filters work for 3.5 gallon tanks ?
Answer by ChewyNov 27, 2020
These Whisper Bio-Bags Small Filter Cartridge are designed to fit Tetra's Whisper PF10 (5-10 gallons) and 3i (up to 3 gallons) Power Filters.

ReviewsWrite a Review

Rated 4.5238 out of 5 stars
42 Ratings
Would recommend to a friend

40 Customer Reviews

Rated 3 out of 5 stars
By Hello on Jul 5, 2022

Better design

These have to much plastic, so cotton fills with debri quickly. Don't last very long.

Rated 5 out of 5 stars
By Bunfish on Mar 26, 2022

Great Product

Great price, good quality. Happy with filtration it provides, water very clear using this filter.

Rated 5 out of 5 stars
By BettaB on Jul 25, 2021


Quick!! Product in stock. Easy checkout. I will use Chewy again for aquarium needs.

Rated 3 out of 5 stars
By Leah on Jan 15, 2021

Upsetting experience!

I love these filters so much I use them in all my tanks. But sadly one came broken! I totally recommend them I’m just sad this happened.

Rated 5 out of 5 stars
By Happyness on Jan 29, 2021

Our beta loves them

Love the convince . I love the home delivery. Cheaper then buying them in the store

Rated 5 out of 5 stars
By Smallunicorns on Dec 7, 2020

Great filters

They do exactly what they’re designed to do, and they do it well.

Rated 5 out of 5 stars
By JenPaz on Oct 7, 2020

Keeps water sparkling clean!

These filters may be small but they work great to keep our Ghost Crayfish's tank clean! Fast delivery!

Rated 5 out of 5 stars
By GG80 on Aug 25, 2020

Love these little filters

These were no that easy to find so was happy to find them in 6 packs.

Rated 5 out of 5 stars
By Phoebesviolets on Feb 9, 2020

Bumps it up!

Provides extra water stability and clarity when added to the filter medium in my small tank with a pair of leleupi.Has helped keep them happy for 5 years now.

Rated 5 out of 5 stars
By Michelle on May 10, 2020

Exactly as described

Great price, arrived by date as advised. Great communication