---
product_id: 69779766
title: "Whisper Bio-Bag Filter Cartridges for Aquariums, Medium Filter for Freshwater and Marine Fish, Removes Odors and Discoloration, Easy to Assemble, 6 Medium Green Filters"
brand: "tetra"
price: "$25.66"
currency: USD
in_stock: true
reviews_count: 8
category: "Tetra"
url: https://www.desertcart.us/products/69779766-whisper-bio-bag-filter-cartridges-for-aquariums-medium-filter-freshwater
store_origin: US
region: United States of America
---

# Color-coded for easy size ID Dual-sided dense mesh traps debris Monthly replaceable for optimal clarity Whisper Bio-Bag Filter Cartridges for Aquariums, Medium Filter for Freshwater and Marine Fish, Removes Odors and Discoloration, Easy to Assemble, 6 Medium Green Filters

**Brand:** tetra
**Price:** $25.66
**Availability:** ✅ In Stock

## Summary

> 🟩 Keep your aquarium whisper-quiet and crystal clear — because your fish deserve the best!

## Quick Answers

- **What is this?** Whisper Bio-Bag Filter Cartridges for Aquariums, Medium Filter for Freshwater and Marine Fish, Removes Odors and Discoloration, Easy to Assemble, 6 Medium Green Filters by tetra
- **How much does it cost?** $25.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/69779766-whisper-bio-bag-filter-cartridges-for-aquariums-medium-filter-freshwater)

## Best For

- tetra enthusiasts

## Why This Product

- Trusted tetra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Maintenance:** Easy-to-assemble cartridges save time and hassle on every filter change.
- • **Crystal Clear Water, Always:** Ultra-Activated® carbon removes odors & discoloration for pristine aquariums.
- • **Eco-Smart Replacement Cycle:** Recommended monthly swaps keep your aquatic environment fresh and healthy.
- • **Tailored Fit, Zero Guesswork:** Color-coded medium size fits Tetra Whisper IQ 10 & PF10 filters perfectly.
- • **Trusted Legacy, Proven Performance:** From Tetra, a brand with 70+ years of fishkeeping innovation and reliability.

## Overview

Tetra Whisper Bio-Bag Filter Cartridges are medium-sized, color-coded replacement filters designed for Tetra Whisper power filters. Featuring dual-sided dense mesh and Ultra-Activated® carbon, they efficiently remove debris, odors, and discoloration to maintain crystal-clear freshwater and marine aquariums. Easy to assemble and replace monthly, these cartridges combine convenience with proven Tetra quality trusted by over 10,000 happy customers.

## Description

Tetra® aquarium products area dedicated to helping seasoned hobbyists and beginners alike enjoy a successful, life-long aquatic experience. Tetra products build fish-, reptile- and pond-keeping confidence, one innovation at a time. Our complete line of Tetra® nutrition, water care, filtration and aquarium products help make fishkeeping accessible to all hobbyists so they can benefit from its rewards. Tetra® Whisper® Bio-Bag® Disposable Filter Cartridges keep aquarium water crystal clear and remove odors and discoloration. The dense, dual-sided mesh catches debris and fish waste. Ultra-Activated® carbon helps remove odors. Use these replacement filter cartridges in your Tetra® power filter – each package is color-coded to make it simple to remember which size to purchase. These replacement filters are easy to assemble and easy to replace. Clear water made simple. Replace a clogged Bio-Bag filter cartridge when there is reduced water flow out of the filter. For best results, change your filter cartridge monthly or sooner if needed. Choose the Medium cartridge for Tetra Whisper IQ 10 and PF10 external power filters and for Tetra Whisper 10i Internal Power Filters. Since 1951, Tetra has developed the world’s most comprehensive body of fish food knowledge, and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need – from a large variety of quality fish food and innovative equipment to test kits and decor.

Review: For very small extra effort you save a lot of money, a great value - We have two Tetra Whisper fish filters. These assemble-yourself filter cartridges or "bags" are, after assembly, the same as the ones you can buy ready to use but much, much cheaper. It is extremely easy to assemble them and everything you need is included, very nice and I think a "no brainer". NOTE: I recommend not following their assembly instructions in one respect. ("Assembly" means turning off the filter unit, removing the old, dirty cartridge to work on it, changing out the filter bag and charcoal [ditch the old, put in the new], and re-installing.) The instructions say to put the re-useable frame inside the bag first, then pour in the charcoal. I find that no matter how careful I am, some of the little charcoal particles spill out of the narrow opening or bounce off the frame as you pour and they wind up, (a.) not in the filter so less service life, and, (b.) on the floor or counter to be cleaned up. Instead, I recommend pouring the charcoal into the bag first with the bag "mouth" wide open and unobstructed, much easier and less mess and waste, then insert the frame into the bag. The only caveat is that with the charcoal in a pile at the bottom of the bag, the frame may not go down in all the way, so have to shake or flick the bag a bit then settle the frame in deeper once or twice, much as you might flick a single-serve paper bag of sugar to move sugar out of the way before tearing off the top. I haven't "autopsied" a factory-assembled bag vs one of these to confirm that they aren't cheating by putting in less charcoal, the price difference is so great that it's surprising, but they seem to work for as long as the factor-assembled ones. The box says "Made in U.S.A." so I hope we're not putting someone out of work by taking away their factory assembly job, but I'm sure the factory-assemble versions remain a major part of the market. We keep a few factory-assembled ones around for when we are away and the pet sitter may have to change cartridges, not they couldn't use these (not rocket science!) but we try to make it easier for them. For us, we use only these unassembled ones. The Whisper filters seem effective and are quiet. They do build up some crud over time and should be rinsed out once in a while, including taking off the bottom section (intake screen and pump), but other than that they seem good. Of course, the local pet store fish experts, who do seem to know their stuff, say that sometimes cleaning is good and eliminates crud that otherwise makes the water cloudy and the fish prone to infection, while other times cleaning removes "good" slime and organic material that are necessary to support or are part of the "good" bacteria that should be present in an aquarium to digest and remove ammonia and nitrates (i.e., piss-eating bacteria), since not having them results in impurity build-up in the water than can irritate, hurt, or ultimately kills the fish. But no one has been able to tell me how to tell good slime or crud from bad slime and crud beyond saying that if the tank water looks clear, don't sweat the slime, but if cloudy, that's bad. They also say to add "biological" treatments or additives when appropriate to establish or restore lost good bacteria, but then add that the "good" bacteria under some conditions can also make water cloudy and bad. Confused yet? So am I. At this point, I should say that I like hamsters and cats and dogs myself, but we have the fish for the kids (sigh) and we do the best we can. So if you have fish and this type of water filter, I would recommend these unassembled ones, they are sooo much less expensive than factory assembled, easy and very little trouble to assemble yourself, so you can save money and/or change filters cartridges more often. It's all good.
Review: Bargain. - Classic brand works well.

## Features

- UNASSEMBLED REPLACEMENT CARTRIDGE: Helps keep aquarium water crystal clear – helps remove odors and discoloration.
- CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste.
- FITS TETRA WHISPER POWER FILTERS: Color coded to make it simple to remember which replacement cartridge size to purchase.
- CONVENIENT: Easy to assemble and easy to replace.
- USAGE: Change monthly or sooner if needed.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Tetra |
| Customer Reviews | 4.7 out of 5 stars 10,152 Reviews |
| Item Form | Liquid |
| Liquid Volume | 1 Fluid Ounces |
| Manufacturer | Tetra |
| Pet Type | Dog |
| UPC | 046798263500 |

## Product Details

- **Brand:** Tetra
- **Liquid Volume:** 1 Fluid Ounces
- **Item Form:** Liquid
- **Manufacturer:** Tetra
- **Pet Type:** Dog

## Images

![Whisper Bio-Bag Filter Cartridges for Aquariums, Medium Filter for Freshwater and Marine Fish, Removes Odors and Discoloration, Easy to Assemble, 6 Medium Green Filters - Image 1](https://m.media-amazon.com/images/I/81tf9gAYq-L.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: does anyone have the exact measurements for the X large + Medium filters?  Thanks**
A: Must be a secret - I sure don't understand why the seller doesn't clearly list the size.Whisper Bio-Bag Filters are slightly tapered in the drawing. Width dimensions are at the top.Large: 4.6 wide x 6.4 tallMedium/"Junior":  3.0 wide x 5.2 tallSmall: 2.1 wide x 3.8 tallFound dimensions on the Tetra website but not sure the link address will work here. Here is the PDF file link:http://cdn.spectrumbrands.com/~/media/UPG/Tetra/Aquarium/Equipment/Replacement%20Filter%20Cartridges/WhisperCartridges.ashxIf this doesn't work go to their website at: www.tetra-fish.com and search for "Tetra Whisper Unassembled Bio-Bag Filter Cartridges"

**Q: Does it fit topfin power filter 10?**
A: I bought these about a month ago for my top fin 10 filter.  The cartridge in my top fin 10 is angled inward at the bottom whereas this filter cartridge is more of a rectangular shape.  Due to the shape it does not fit the top fin 10 slot.  However I kept my old cartridge frame and I'm using this product, everything works great.

**Q: What is the difference between the 26164 and  ATS26164? Both seem to be 12 large Whisper filter cartridges.**
A: Hi, I use the Medium size whisper filter cartridges...the difference between the 26164 & ATS26164 could be the fact that one is a pre-assembled cartridge and the other is not.  I buy the 12 pack of unassembled filters which are quite a bit cheaper and are the identical product.  It comes with the white filters, one plastic insert, and small charcoal bags that take a few minutes to assemble.  Hope this helps.

**Q: medium size it's for 10 galons?**
A: Hi Oscar, the medium size fits the Whisper PF10 and the Whisper 20 Power Filters.

## Customer Reviews

### ⭐⭐⭐⭐⭐ For very small extra effort you save a lot of money, a great value
*by S***H on January 8, 2013*

We have two Tetra Whisper fish filters. These assemble-yourself filter cartridges or "bags" are, after assembly, the same as the ones you can buy ready to use but much, much cheaper. It is extremely easy to assemble them and everything you need is included, very nice and I think a "no brainer". NOTE: I recommend not following their assembly instructions in one respect. ("Assembly" means turning off the filter unit, removing the old, dirty cartridge to work on it, changing out the filter bag and charcoal [ditch the old, put in the new], and re-installing.) The instructions say to put the re-useable frame inside the bag first, then pour in the charcoal. I find that no matter how careful I am, some of the little charcoal particles spill out of the narrow opening or bounce off the frame as you pour and they wind up, (a.) not in the filter so less service life, and, (b.) on the floor or counter to be cleaned up. Instead, I recommend pouring the charcoal into the bag first with the bag "mouth" wide open and unobstructed, much easier and less mess and waste, then insert the frame into the bag. The only caveat is that with the charcoal in a pile at the bottom of the bag, the frame may not go down in all the way, so have to shake or flick the bag a bit then settle the frame in deeper once or twice, much as you might flick a single-serve paper bag of sugar to move sugar out of the way before tearing off the top. I haven't "autopsied" a factory-assembled bag vs one of these to confirm that they aren't cheating by putting in less charcoal, the price difference is so great that it's surprising, but they seem to work for as long as the factor-assembled ones. The box says "Made in U.S.A." so I hope we're not putting someone out of work by taking away their factory assembly job, but I'm sure the factory-assemble versions remain a major part of the market. We keep a few factory-assembled ones around for when we are away and the pet sitter may have to change cartridges, not they couldn't use these (not rocket science!) but we try to make it easier for them. For us, we use only these unassembled ones. The Whisper filters seem effective and are quiet. They do build up some crud over time and should be rinsed out once in a while, including taking off the bottom section (intake screen and pump), but other than that they seem good. Of course, the local pet store fish experts, who do seem to know their stuff, say that sometimes cleaning is good and eliminates crud that otherwise makes the water cloudy and the fish prone to infection, while other times cleaning removes "good" slime and organic material that are necessary to support or are part of the "good" bacteria that should be present in an aquarium to digest and remove ammonia and nitrates (i.e., piss-eating bacteria), since not having them results in impurity build-up in the water than can irritate, hurt, or ultimately kills the fish. But no one has been able to tell me how to tell good slime or crud from bad slime and crud beyond saying that if the tank water looks clear, don't sweat the slime, but if cloudy, that's bad. They also say to add "biological" treatments or additives when appropriate to establish or restore lost good bacteria, but then add that the "good" bacteria under some conditions can also make water cloudy and bad. Confused yet? So am I. At this point, I should say that I like hamsters and cats and dogs myself, but we have the fish for the kids (sigh) and we do the best we can. So if you have fish and this type of water filter, I would recommend these unassembled ones, they are sooo much less expensive than factory assembled, easy and very little trouble to assemble yourself, so you can save money and/or change filters cartridges more often. It's all good.

### ⭐⭐⭐⭐⭐ Bargain.
*by D***. on December 28, 2025*

Classic brand works well.

### ⭐⭐⭐⭐⭐ Very good
*by R***W on January 5, 2026*

Easy to put together and works

## Frequently Bought Together

- Tetra Whisper Bio-Bag Filter Cartridges for Aquariums, Medium Filter for Freshwater and Marine Fish, Removes Odors and Discoloration, Easy to Assemble, 6 Medium Green Filters
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-22*