---
product_id: 250498430
title: "Whisper Internal Filter 10 To 20 Gallons, For aquariums, In-Tank Filtration With Air Pump"
brand: "tetra"
price: "1922 kr"
currency: DKK
in_stock: true
reviews_count: 6
category: "Tetra"
url: https://www.desertcart.dk/products/250498430-whisper-internal-filter-10-to-20-gallons-for-aquariums-in
store_origin: DK
region: Denmark
---

# 125 GPH filtration flow ultra-quiet in-tank motor easy Bio-Bag cartridge swap Whisper Internal Filter 10 To 20 Gallons, For aquariums, In-Tank Filtration With Air Pump

**Brand:** tetra
**Price:** 1922 kr
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your aquarium game with whisper-quiet, powerhouse filtration!

## Quick Answers

- **What is this?** Whisper Internal Filter 10 To 20 Gallons, For aquariums, In-Tank Filtration With Air Pump by tetra
- **How much does it cost?** 1922 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/250498430-whisper-internal-filter-10-to-20-gallons-for-aquariums-in)

## 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:** Large, easy-to-change Bio-Bag cartridges make filter upkeep a breeze.
- • **Whisper-Quiet Operation:** Submerged motor design drastically reduces noise—perfect for office or home ambiance.
- • **Seamless In-Tank Integration:** Mounts inside your aquarium for a sleek, flush look—no bulky external parts.
- • **Dual-Sided Mesh Debris Capture:** Dense mesh traps fish waste and debris, keeping your tank crystal clear.
- • **Powerful & Efficient Filtration:** Filters up to 125 gallons per hour while aerating water for a healthier aquatic environment.

## Overview

The Tetra Whisper Internal Filter 10-20 Gallons combines an air pump and water filter in a compact, in-tank design that filters up to 125 gallons per hour. Its dual-sided mesh efficiently traps debris while aerating water, and the submerged motor ensures whisper-quiet operation. Easy-to-replace Bio-Bag cartridges and versatile mounting options make it ideal for aquariums placed flush against walls, delivering professional-grade filtration with minimal noise.

## Description

For the ultimate in convenience and quiet, choose a Whisper In-Tank Filter. These filters mount on the inside of the aquarium, rather than hanging from the outside -- making it possible to place the tank flush against a wall. In-Tank Filters are unusually quiet, since the motor is under the water. Offering the same quality and performance as an external filter, the Whisper In-Tank Filter will function in as little as 2 inches of water -- making it ideal for turtle tanks, or for creating a waterfall inside the tank.The Whisper In-Tank filter features adjusts easily to high or low water levels with mounting suction cups and/or bracket. Each filter comes with one pre-assembled Whisper Bio-Bag filter cartridge.

Review: Pump burned - Worst pump ever within 20 mins of usage it burned and stopped working
Review: Started with too much of noise and broke down in 15mins

## Features

- UNIVERSAL DESIGN: Tetra Whisper 20i 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 125 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 | B0002DHYG8 |
| Department | Unisex-Adult |
| Generic Name | Tetra Whisper Internal Filter |
| Included Components | Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump |
| Item Dimensions LxWxH | 12.4 x 13.7 x 25.9 Centimeters |
| Item Weight | 658 g |
| Item model number | 25817 |
| Manufacturer | Tetra |
| Net Quantity | 1 Count |
| Product Dimensions | 12.4 x 13.67 x 25.88 cm; 657.71 g |

## Images

![Whisper Internal Filter 10 To 20 Gallons, For aquariums, In-Tank Filtration With Air Pump - Image 1](https://m.media-amazon.com/images/I/81g1VKwt4dL.jpg)

## Questions & Answers

**Q: What size replacement filter cartridge for this unit...small, med?**
A: The Tetra Bio-Bag Large (formerly known as Regular) are the exact same as the filter bag supplied with the Tetra Whisper In-Tank filter 20i. I got both from Amazon: filter $11.89; 12 cartridges $12.28. These filters last a long time, can be cleaned and reused. For my purpose, this filter has been great.

**Q: Where can I just get the Bioscrubber?**
A: Hello. You can get it at a pet store, amazon has some, grocery stores with a pet section...they are pretty easy to find.

**Q: Would a small fish get sucked up in this filter? I have a 2 month old beta who is just recently getting color fins but still very small**
A: Yes. I had 4 neon tetras and all 4 ended up getting sucked into the filter and the spinning fan mechanism blended them into multiple pieces. It happened the first night, I woke up and 4 fish were missing. I found them in the filter :(

**Q: Would this filter be too strong for a Betta in a 10 gallon tank?**
A: Yes, it would be fine.  It is rated at 90 GPH which is the appropriate flow rate for a 10 gallon tank.  Bettas are not the strongest swimmers, it is true, but typically handle filtration fine, as long as it is placed at one end of the tank so they have room to move away if necessary. They eventually adapt and will often play in the flowing water.  Initially, you might want to place tall plants or tall décor in front of it to break up the flow until the betta becomes accustomed to it.  For additional assistance, please call the Tetra Consumer Relations Team at 1-800-526-0650.

## Customer Reviews

### ⭐ Pump burned
*by V***. on 20 January 2019*

Worst pump ever within 20 mins of usage it burned and stopped working

### ⭐ Review
*by M***N on 27 March 2023*

Started with too much of noise and broke down in 15mins

### ⭐ Review
*by B***E on 23 August 2024*

Motor is not woking properly, very big broken sounds is coming out from the motor, request amazon to refund, very sad.

## Frequently Bought Together

- Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump
- API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle
- Tetra Whisper Easy to Use Air Pump for Aquariums (Non-UL)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-25*