---
product_id: 2015177
title: "Whisper Bio-Bag Large Filter Cartridges for Aquariums, 12 Count, Unassembled, Fits Tetra Whisper Fish Tank Filters 10-30 Gal, 20-40 Gal, PF-20, 30, 40, 60, IQ 20, 30, 45, 60"
brand: "tetra"
price: "KD 18.94"
currency: KWD
in_stock: true
reviews_count: 10
category: "Tetra"
url: https://www.desertcart.com.kw/products/2015177-whisper-bio-bag-large-filter-cartridges-for-aquariums-12-count
store_origin: KW
region: Kuwait
---

# Crystal-clear water clarity Reusable plastic cartridge frame Easy assembly & replacement Whisper Bio-Bag Large Filter Cartridges for Aquariums, 12 Count, Unassembled, Fits Tetra Whisper Fish Tank Filters 10-30 Gal, 20-40 Gal, PF-20, 30, 40, 60, IQ 20, 30, 45, 60

**Brand:** tetra
**Price:** KD 18.94
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your aquatic world crystal clear — because your fish deserve the best!

## Quick Answers

- **What is this?** Whisper Bio-Bag Large Filter Cartridges for Aquariums, 12 Count, Unassembled, Fits Tetra Whisper Fish Tank Filters 10-30 Gal, 20-40 Gal, PF-20, 30, 40, 60, IQ 20, 30, 45, 60 by tetra
- **How much does it cost?** KD 18.94 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/2015177-whisper-bio-bag-large-filter-cartridges-for-aquariums-12-count)

## 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

- • **Color-Coded Size Fit:** Perfectly matches Tetra Whisper filters for hassle-free replacements
- • **Dual-Sided Dense Mesh:** Traps debris & fish waste efficiently, keeping your tank spotless
- • **Eco-Friendly & Cost-Savvy:** Unassembled packs reduce waste and save you money over pre-assembled units
- • **Ultra-Activated Carbon Power:** Eliminates odors & discoloration for pristine aquarium vibes
- • **Monthly Maintenance Made Simple:** Quick swap design encourages timely changes to protect your aquatic ecosystem

## Overview

Tetra Whisper Bio-Bag Filter Cartridges are large, unassembled replacement filters designed for Tetra Whisper freshwater and marine aquarium filters. Featuring ultra-activated carbon and a dense dual-sided mesh, they effectively remove odors, discoloration, and debris to maintain crystal-clear water. Color-coded for easy size identification, these cartridges are simple to assemble and replace monthly, offering an eco-friendly and cost-effective solution for professional aquarium maintenance.

## Description

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 absorbs odors. Use these replacement filter cartridges in your Tetra® water 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. Size large. Choose the medium size filter cartridge to fit the Tetra Whisper PF10 Power Filter, 10i Internal Filter and Reptofilter® 90 GPH; and choose the large cartridge to fit the Tetra Whisper 20, 30, 40 and 60 Power Filters and 20i and 40i Internal 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: Excellent value. Here are the dimensions - Size: Large 12 Pack First: People want to know what the actual size of these are so they can decide if they'll fit their filter. I got these to use with a Tetra Whisper 30-60 that I got at WalMart. They're exactly the right size for this filter (and certain others, of course). Measuring the bags or the frame over which you place the bags gives, of course different dimensions. But here's what I get measuring a brand new bag stretched over the frame at the very outside edges of the bag: The frame and bags are tapered so that they're narrower at the bottom and get wider towards the top. That allows them to be inserted into the filter more easily yet still fit in tight enough to make it hard for the water to short circuit around the bag. At the top, measuring to the very outermost reaches of an unused bag, I get a width of almost exactly 5". At the bottom, where it's narrower, measuring the very outermost edges of an unused bag, I get a little under 4 3/4". The height, again, measuring from the very bottom of the edge of the bag to the top of the frame (which sticks out above the top of the bag, of course), I get a height of just about exactly 7". Naturally, the bag's edges get smashed inward a bit, its edges curling up and mooshing in as you slide it down into the slot for it in the filter. So measuring a used, wet, bag will give you slightly smaller dimensions. It might actually be of more use to people to know the dimensions of the frame since that's what has to match and fit exactly into your filter, and you can measure your existing bag frame to see if it'll be the same. The frame I got with these "Large" bags is about 6 3/8" tall, 4 5/8" wide at the very top, and about 4 1/4" wide at the bottom. I'd compare those dimensions with the existing frame from one of your filter bag assemblies to decide if these "Large" bags will fit your particular filter. I cannot comment on the sizes of the medium or extra large bags. Again, the ones I got are the "Large" size. ------------------------------- Now for the review: Based on use with my Tetra Whisper 30-60, these work just the same as the pre-assembled units, but cost a lot less. Once assembled, they're exactly the same as what come with the filter. The amount of activated carbon supplied for each bag in these kits is the same as the amount that comes in the pre-assembled elements. I personally don't think it's enough, so I like to add more (about three times as much as what is supplied) when I make up or clean mine. That means obtaining similar granular activated carbon elsewhere, of course. ------------------------------- A bit of advice for people new to all of this: One thing that's important to keep in mind with any aquarium filter is that along with mechanical filtration (to get out obvious debris) and chemical filtration (the activated carbon), the main function of most aquarium filters is the biological filtration provided by the so-called "beneficial bacteria" which hopefully colonize your filter elements. The basic idea of this biofiltration is that two types of bacteria will eventually colonize the surfaces in your aquarium and especially your filter media. One type of bacteria "eats" the ammonia excreted by your fish, and, as their waste product, excrete nitrite. The second type of bacteria "eats" nitrite, and, as their waste product, excrete nitrate. Ammonia is highly toxic to fish even at fairly low concentrations (depending on pH to a great degree). Nitrite is also quite toxic to fish. Nitrate (the end result of all of this bacterial action) can be harmful to fish at high enough concentrations, but is not nearly as bad as the ammonia (produced by the fish) and the nitrite (produced by the first type of bacteria mentioned). So once your aquarium and filter system have established colonies of beneficial bacteria large enough to metabolize the amount of ammonia produced by your fish, the main things that harm fish in a closed system (like an aquarium) will be kept in control. However, the nitrates will still build up over time, and this is why we need to do periodic water changes on our aquariums. People do water changes every week or two, generally. But without sufficient bacterial colonies, the ammonia produced by the fish would kill them in very short order. You'd need to do almost constant water changes to keep the fish healthy. So the main point I want to make is this: If you remove and replace, or clean too thoroughly, your filter media, then you will be discarding much of your beneficial bacteria. This can kill your fish. To learn more about this, read up about the "Nitrogen Cycle" for an aquarium. So with a filter like the Whisper 30-60 that has two identical sets of filter elements, I prefer to avoid replacing the filter bags until they're absolutely falling apart. Instead, I rinse them out in used aquarium water and replace the activated carbon when doing a water change. This preserves the bacteria colonies in them and avoids shocking the tank by removing too much of its beneficial bacteria all at once, destroying the balance. Remember: You need to have enough bacteria present to handle the amount of ammonia produced by your fish (and rotting food from overfeeding), etc. Over time, the bacteria colonies grow to match the amount of ammonia being produce by your fish and your excess feeding. But there isn't a lot of excess bacteria because if there were, some of them would starve off due to a lack of ammonia. So the bacteria tends to stay in balance with your fish "load". If you suddenly remove a large percentage of the bacteria present in the tank and filter(s), then, until the bacteria can reproduce and the colonies grow back, there will likely be an excess of ammonia, and this can kill or injure your fish quite rapidly. So you want to protect your bacteria so it can protect your fish. I never do much of anything to the open-cell foam elements. They're meant to house a lot of beneficial bacteria, and cleaning them off will just remove that needed bacterial slime (biofilm). You don't want them to plug off, of course, but if you've maintained the bag filters ahead of them, then nothing should reach these foam elements to clog them up, anyhow. If they do plug, though, then I recommend rinsing them gently in used aquarium water, and not trying to get them too clean. Remember: You WANT that slime of biofilm to remain since that's your necessary bacteria colonies! The thin slime layer is good. :) When I do need to actually replace one of the filter bags, I only do one side of the filter at a time, waiting a month or more before replacing the other side. That way, hopefully the first bag that was replaced will have built up enough of a bacteria colony to handle a lot of the load before I dispose of the other one. Some of these filters are smaller and only have one bag and one foam element. In that case, you want to be especially careful not to clean the foam element if possible. And ideally, don't replace the filter bag any more often than you have to. Again, just rinse it out in used aquarium water to restore good flow, and replace the activated carbon when you're doing a cleaning. When you DO have to replace the filter bag (they last about a year for me) you may want to rinse what's left of the old bag, and then put it into your filter right behind the fresh new one. Then leave it in there for a month or so to provide its bacterial help while the new bag gets seeded from it (the old one), and finally establishes its own new colonies of bacteria. I like to have several filters in each tank. That provides a "backup" location for bacterial colonies to help handle the load when you do have to clean or replace a filter or have a failure of some type. There are some great on-line forums for fish keeping where you can ask questions and learn more about all of this.
Review: Aquarium enthusiasts Will Love This Filter - This filter cartridge is designed for the Tetra Whisper 40I internal aquarium filter; however, it may fit other brands of filters. This cartridge is useful to all aquarium owners, from the beginner to the expert, who have purchased the corresponding filter. It is a very common filter and is available at most large pet stores and Wal-Mart. This is a great go-to filter cartridge based of these attributes; price, usability, and ease of use. The main advantage of this product is the price. It is much more affordable to purchase these unassembled cartridges then the assembled cartridges at the store, and it is more affordable to order them online then to buy at the store. This is very important to me as I have three of the filters running at all times. With a variety of sizes ranging from 3 gallons to 40 gallons, there is a filter for the most common sizes of aquariums, and a cartridge to match. These filters are very useful as they can be used for all types of fish tanks. I have used them for marine tanks and am currently using them for a 30-gallon freshwater fish tank and a 55-gallon turtle tank (two filters for his messy habitat). This filter cartridge is quick and easy to assemble. In just a few minutes you can remove the used filter, apply a new a new bag and add the prepackaged activated charcoal. While the assembled cartridges are more convenient, by using the unassembled cartridges you are able to purchase more at a lesser cost. The added advantage of buying the unassembled cartridges is the production of less waste. Each box comes with one plastic cartridge frame which is reused every time a cartridge is changed. This filter cartridge works! I had come back from vacation and found the turtle has made such a mess of his water that I can barely see him swimming it. I did not have the time to change his water before I had to leave for class, so I quick changed the filter cartridges. When I returned 3-4 hours later the tank was almost completely clear. I was truly impressed.

## Features

- UNASSEMBLED REPLACEMENT CARBON FILTER Keeps aquarium water crystal clear – removes odors and discoloration
- CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
- FITS TETRA WHISPER WATER 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 |
|---------------|-------|
| ASIN | B001DCZUO0 |
| ASIN  | B001DCZUO0 |
| Allergen Information | Abalone Free |
| Batteries  | Product Specific batteries required. |
| Best Sellers Rank | #1,449 in Pet Supplies ( See Top 100 in Pet Supplies ) #1 in Aquarium Filter Accessories |
| Brand Name | Tetra |
| Customer Reviews | 4.7 4.7 out of 5 stars (18,469) |
| Date First Available  | June 24, 2004 |
| Department  | Unisex-Adult |
| Global Trade Identification Number | 00046798261643, 30046798261644 |
| Included Components | packs remove waste particles, odors, and discoloration |
| Is Discontinued By Manufacturer  | No |
| Item Form | Filter Part |
| Item Type Name | Bio-Bag Filter Cartridge |
| Item Weight | 12.8 ounces |
| Item model number  | 26164 |
| Liquid Volume | 5 Liters |
| Manufacturer | Tetra |
| Manufacturer  | Tetra |
| Manufacturer Part Number | AQ-26164-1 |
| Manufacturer recommended age  | 12 months and up |
| Model Number | 26164 |
| Pet Type | Dog |
| Product Dimensions  | 5 x 9.25 x 8 inches; 12.8 ounces |
| Target Species | Fish |
| UPC | 046798261643 |
| Unit Count | 12 Count |
| Warranty Description | As Labeled |

## Product Details

- **Brand:** Tetra
- **Item Form:** Filter Part
- **Item Weight:** 12.8 ounces
- **Liquid Volume:** 5 Liters
- **Manufacturer:** Tetra

## Images

![Whisper Bio-Bag Large Filter Cartridges for Aquariums, 12 Count, Unassembled, Fits Tetra Whisper Fish Tank Filters 10-30 Gal, 20-40 Gal, PF-20, 30, 40, 60, IQ 20, 30, 45, 60 - Image 1](https://m.media-amazon.com/images/I/71hLn+9WL1L.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent value. Here are the dimensions
*by J***O on February 12, 2016*

Size: Large 12 Pack First: People want to know what the actual size of these are so they can decide if they'll fit their filter. I got these to use with a Tetra Whisper 30-60 that I got at WalMart. They're exactly the right size for this filter (and certain others, of course). Measuring the bags or the frame over which you place the bags gives, of course different dimensions. But here's what I get measuring a brand new bag stretched over the frame at the very outside edges of the bag: The frame and bags are tapered so that they're narrower at the bottom and get wider towards the top. That allows them to be inserted into the filter more easily yet still fit in tight enough to make it hard for the water to short circuit around the bag. At the top, measuring to the very outermost reaches of an unused bag, I get a width of almost exactly 5". At the bottom, where it's narrower, measuring the very outermost edges of an unused bag, I get a little under 4 3/4". The height, again, measuring from the very bottom of the edge of the bag to the top of the frame (which sticks out above the top of the bag, of course), I get a height of just about exactly 7". Naturally, the bag's edges get smashed inward a bit, its edges curling up and mooshing in as you slide it down into the slot for it in the filter. So measuring a used, wet, bag will give you slightly smaller dimensions. It might actually be of more use to people to know the dimensions of the frame since that's what has to match and fit exactly into your filter, and you can measure your existing bag frame to see if it'll be the same. The frame I got with these "Large" bags is about 6 3/8" tall, 4 5/8" wide at the very top, and about 4 1/4" wide at the bottom. I'd compare those dimensions with the existing frame from one of your filter bag assemblies to decide if these "Large" bags will fit your particular filter. I cannot comment on the sizes of the medium or extra large bags. Again, the ones I got are the "Large" size. ------------------------------- Now for the review: Based on use with my Tetra Whisper 30-60, these work just the same as the pre-assembled units, but cost a lot less. Once assembled, they're exactly the same as what come with the filter. The amount of activated carbon supplied for each bag in these kits is the same as the amount that comes in the pre-assembled elements. I personally don't think it's enough, so I like to add more (about three times as much as what is supplied) when I make up or clean mine. That means obtaining similar granular activated carbon elsewhere, of course. ------------------------------- A bit of advice for people new to all of this: One thing that's important to keep in mind with any aquarium filter is that along with mechanical filtration (to get out obvious debris) and chemical filtration (the activated carbon), the main function of most aquarium filters is the biological filtration provided by the so-called "beneficial bacteria" which hopefully colonize your filter elements. The basic idea of this biofiltration is that two types of bacteria will eventually colonize the surfaces in your aquarium and especially your filter media. One type of bacteria "eats" the ammonia excreted by your fish, and, as their waste product, excrete nitrite. The second type of bacteria "eats" nitrite, and, as their waste product, excrete nitrate. Ammonia is highly toxic to fish even at fairly low concentrations (depending on pH to a great degree). Nitrite is also quite toxic to fish. Nitrate (the end result of all of this bacterial action) can be harmful to fish at high enough concentrations, but is not nearly as bad as the ammonia (produced by the fish) and the nitrite (produced by the first type of bacteria mentioned). So once your aquarium and filter system have established colonies of beneficial bacteria large enough to metabolize the amount of ammonia produced by your fish, the main things that harm fish in a closed system (like an aquarium) will be kept in control. However, the nitrates will still build up over time, and this is why we need to do periodic water changes on our aquariums. People do water changes every week or two, generally. But without sufficient bacterial colonies, the ammonia produced by the fish would kill them in very short order. You'd need to do almost constant water changes to keep the fish healthy. So the main point I want to make is this: If you remove and replace, or clean too thoroughly, your filter media, then you will be discarding much of your beneficial bacteria. This can kill your fish. To learn more about this, read up about the "Nitrogen Cycle" for an aquarium. So with a filter like the Whisper 30-60 that has two identical sets of filter elements, I prefer to avoid replacing the filter bags until they're absolutely falling apart. Instead, I rinse them out in used aquarium water and replace the activated carbon when doing a water change. This preserves the bacteria colonies in them and avoids shocking the tank by removing too much of its beneficial bacteria all at once, destroying the balance. Remember: You need to have enough bacteria present to handle the amount of ammonia produced by your fish (and rotting food from overfeeding), etc. Over time, the bacteria colonies grow to match the amount of ammonia being produce by your fish and your excess feeding. But there isn't a lot of excess bacteria because if there were, some of them would starve off due to a lack of ammonia. So the bacteria tends to stay in balance with your fish "load". If you suddenly remove a large percentage of the bacteria present in the tank and filter(s), then, until the bacteria can reproduce and the colonies grow back, there will likely be an excess of ammonia, and this can kill or injure your fish quite rapidly. So you want to protect your bacteria so it can protect your fish. I never do much of anything to the open-cell foam elements. They're meant to house a lot of beneficial bacteria, and cleaning them off will just remove that needed bacterial slime (biofilm). You don't want them to plug off, of course, but if you've maintained the bag filters ahead of them, then nothing should reach these foam elements to clog them up, anyhow. If they do plug, though, then I recommend rinsing them gently in used aquarium water, and not trying to get them too clean. Remember: You WANT that slime of biofilm to remain since that's your necessary bacteria colonies! The thin slime layer is good. :) When I do need to actually replace one of the filter bags, I only do one side of the filter at a time, waiting a month or more before replacing the other side. That way, hopefully the first bag that was replaced will have built up enough of a bacteria colony to handle a lot of the load before I dispose of the other one. Some of these filters are smaller and only have one bag and one foam element. In that case, you want to be especially careful not to clean the foam element if possible. And ideally, don't replace the filter bag any more often than you have to. Again, just rinse it out in used aquarium water to restore good flow, and replace the activated carbon when you're doing a cleaning. When you DO have to replace the filter bag (they last about a year for me) you may want to rinse what's left of the old bag, and then put it into your filter right behind the fresh new one. Then leave it in there for a month or so to provide its bacterial help while the new bag gets seeded from it (the old one), and finally establishes its own new colonies of bacteria. I like to have several filters in each tank. That provides a "backup" location for bacterial colonies to help handle the load when you do have to clean or replace a filter or have a failure of some type. There are some great on-line forums for fish keeping where you can ask questions and learn more about all of this.

### ⭐⭐⭐⭐⭐ Aquarium enthusiasts Will Love This Filter
*by N***T on September 15, 2018*

This filter cartridge is designed for the Tetra Whisper 40I internal aquarium filter; however, it may fit other brands of filters. This cartridge is useful to all aquarium owners, from the beginner to the expert, who have purchased the corresponding filter. It is a very common filter and is available at most large pet stores and Wal-Mart. This is a great go-to filter cartridge based of these attributes; price, usability, and ease of use. The main advantage of this product is the price. It is much more affordable to purchase these unassembled cartridges then the assembled cartridges at the store, and it is more affordable to order them online then to buy at the store. This is very important to me as I have three of the filters running at all times. With a variety of sizes ranging from 3 gallons to 40 gallons, there is a filter for the most common sizes of aquariums, and a cartridge to match. These filters are very useful as they can be used for all types of fish tanks. I have used them for marine tanks and am currently using them for a 30-gallon freshwater fish tank and a 55-gallon turtle tank (two filters for his messy habitat). This filter cartridge is quick and easy to assemble. In just a few minutes you can remove the used filter, apply a new a new bag and add the prepackaged activated charcoal. While the assembled cartridges are more convenient, by using the unassembled cartridges you are able to purchase more at a lesser cost. The added advantage of buying the unassembled cartridges is the production of less waste. Each box comes with one plastic cartridge frame which is reused every time a cartridge is changed. This filter cartridge works! I had come back from vacation and found the turtle has made such a mess of his water that I can barely see him swimming it. I did not have the time to change his water before I had to leave for class, so I quick changed the filter cartridges. When I returned 3-4 hours later the tank was almost completely clear. I was truly impressed.

### ⭐⭐⭐⭐⭐ Value priced and good quality
*by C***R on December 19, 2025*

My husband said these filters for our 50 gallon fish tank work very well and are easy to assemble.

## Frequently Bought Together

- Tetra Whisper Bio-Bag Filter Aquarium Cartridges, Large Filter for Freshwater and Marine Fish, Removes Odors and Discoloration, Easy to Assemble, 12 Large Blue Filters
- Tetra Whisper Bio-Bag Filter Cartridges for Aquariums, Medium Filter for Freshwater and Marine Fish, Removes Odors and Discoloration, Easy to Assemble, 12 Large Green Filters
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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-05-17*