---
product_id: 2063017
title: "Tetra Whisper Internal Filter 20 To 40 Gallons, For Aquariums, In-Tank Filtration With Air Pump"
brand: "tetra"
price: "€ 74.52"
currency: EUR
in_stock: true
reviews_count: 13
category: "Tetra"
url: https://www.desertcart.nl/products/2063017-tetra-whisper-internal-filter-20-to-40-gallons-for-aquariums
store_origin: NL
region: Netherlands
---

# 170 GPH filtration power Integrated air pump oxygenation Easy Bio-Bag cartridge swap Tetra Whisper Internal Filter 20 To 40 Gallons, For Aquariums, In-Tank Filtration With Air Pump

**Brand:** tetra
**Price:** € 74.52
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your aquarium game with whisper-quiet, all-in-one filtration and aeration!

## Quick Answers

- **What is this?** Tetra Whisper Internal Filter 20 To 40 Gallons, For Aquariums, In-Tank Filtration With Air Pump by tetra
- **How much does it cost?** € 74.52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/2063017-tetra-whisper-internal-filter-20-to-40-gallons-for-aquariums)

## 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

- • **Space-Savvy Mounting:** Internal clip-on filter lets you place your aquarium flush against any wall—no bulky hangers here.
- • **Effortless Maintenance:** Large, easy-to-change Bio-Bag cartridges mean less hassle and more time enjoying your aquatic ecosystem.
- • **Triple-Action Filtration:** Combines activated carbon, dual-sided mesh, and air-driven flow for crystal-clear, odor-free water.
- • **Whisper-Quiet Efficiency:** Submersible design keeps noise minimal so your workspace or living room stays zen.
- • **Optimized for 20-40 Gallons:** Perfectly calibrated for medium tanks, ensuring your fish thrive with balanced oxygen and cleanliness.

## Overview

The Tetra Whisper 40i Internal Filter is a compact, in-tank filtration system designed for 20-40 gallon aquariums. It features a quiet air pump that oxygenates water while filtering up to 170 gallons per hour through a triple-stage process including activated carbon and dual-sided mesh Bio-Bag cartridges. Its internal mounting clip allows tanks to sit flush against walls, combining convenience with powerful, low-maintenance performance trusted by fish enthusiasts worldwide.

## Description

The Tetra® Whisper® 40i Internal Filter for aquariums is the ultimate in quiet, convenient 3-stage filtration. This submersible filter mounts on the inside of the aquarium, rather than hanging from the outside, making it possible to place the tank flush against a wall and easily hide with tank décor. The air pump (included) provides bubbles that move water through the filter, efficiently filtering and oxygenating your aquarium. The water flows through Ultra-Activated® carbon, absorbing odors and discoloration, as well as through the dual-sided mesh of the Bio-Bag® Filter, trapping debris and fish waste. Filters up to 170 GPH while oxygenating water. The Tetra Whisper 40i Internal Filter adjusts easily to high or low water levels with a mounting clip. Each unit includes the filter, air pump, 2 feet of airline tubing and one medium Tetra Whisper Bio-Bag Filter cartridge (change monthly – replacement small filter cartridges available). For 20-40 gallon tanks. 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: I love these. Still going strong after 5 years. Bigger one and smaller one - I have used these for so many years for little tank setups and my turtle and snails etc. Always work super great and super quiet! Plus they are cheap. No brainer imo. I'm sure theres a faulty one here n there as with anything but keep the propeller clean like any other pump and dont let the filters get too overflowing clogged and you'll be happy I promise. Also with filters of any kind try to get one rated for more than you actually have so the filter doesn't get overwhelmed. Even the filters are cheap for a box of 12 for like $13. Cant go wrong!! 10/10
Review: Very reliable, well made and priced very fair. - It works great and is priced very fairly. I have had fish tanks all my life and love the product in all my smaller fish tanks where I store baby fish and or fish that have been picked on. It will last a long time if you take proper care of it.

## Features

- UNIVERSAL DESIGN: Tetra Whisper 40i 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 170 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002DHYH2 |
| ASIN  | B0002DHYH2 |
| Age Range Description | all ranges |
| Batteries | Product Specific batteries required. |
| Batteries  | Product Specific batteries required. |
| Best Sellers Rank | #1,982 in Pet Supplies ( See Top 100 in Pet Supplies ) #3 in Aquarium Filters |
| Brand Name | Tetra |
| Color | Black |
| Customer Reviews | 4.2 4.2 out of 5 stars (22,071) |
| Date First Available | June 9, 2004 |
| Date First Available  | June 9, 2004 |
| Department | Unisex-Adult |
| Department  | Unisex-Adult |
| Directions | See label for details |
| Included Components | Whisper In-Tank Filter 40i (upto 40 Gal) |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 5.85 x 5.09 x 10.29 inches |
| Item Package Dimensions L x W x H | 14.53 x 11.5 x 6.22 inches |
| Item Weight | 1.5 Pounds |
| Item model number | AQ-65818 |
| Item model number  | AQ-65818 |
| Manufacturer | Tetra |
| Manufacturer  | Tetra |
| Material | 100% Polyester |
| Model Name | Whisper Internal Filter |
| Number of Items | 1 |
| Product Dimensions  | 5.85 x 5.09 x 10.29 inches; 1.5 Pounds |
| Size | 20 - 40 Gallons |
| Specific Uses for Product | Indoor |
| Target Audience Keyword | fish |
| Warranty Description | See label |

## Images

![Tetra Whisper Internal Filter 20 To 40 Gallons, For Aquariums, In-Tank Filtration With Air Pump - Image 1](https://m.media-amazon.com/images/I/81W+Z3JdNIL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ I love these. Still going strong after 5 years. Bigger one and smaller one
*by D***T on December 19, 2025*

I have used these for so many years for little tank setups and my turtle and snails etc. Always work super great and super quiet! Plus they are cheap. No brainer imo. I'm sure theres a faulty one here n there as with anything but keep the propeller clean like any other pump and dont let the filters get too overflowing clogged and you'll be happy I promise. Also with filters of any kind try to get one rated for more than you actually have so the filter doesn't get overwhelmed. Even the filters are cheap for a box of 12 for like $13. Cant go wrong!! 10/10

### ⭐⭐⭐⭐⭐ Very reliable, well made and priced very fair.
*by F***A on January 22, 2026*

It works great and is priced very fairly. I have had fish tanks all my life and love the product in all my smaller fish tanks where I store baby fish and or fish that have been picked on. It will last a long time if you take proper care of it.

### ⭐⭐⭐⭐⭐ How can something so simple work so well?
*by R***L on September 26, 2018*

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.

## Frequently Bought Together

- Tetra Whisper Internal Filter 20 To 40 Gallons, For Aquariums, In-Tank Filtration With Air Pump
- Tetra Whisper Bio-Bag Filter Cartridges For Aquariums - Ready To Use BLUE, Large, 3 Count (Pack of 1)
- TetraFauna AquaSafe for Reptiles and Amphibians 3.38 Ounces, Aqua-Terrarium Water Conditioner, Makes Tap Water Safe

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-14*