---
product_id: 13425518
title: "Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank"
brand: "tetra"
price: "€ 99.52"
currency: EUR
in_stock: true
reviews_count: 13
category: "Tetra"
url: https://www.desertcart.hr/products/13425518-tetra-whisper-135-gph-internal-power-filter-for-aquariums-fish
store_origin: HR
region: Croatia
---

# 125 GPH water flow & aeration 3-stage filtration system Universal in-tank clip mount Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank

**Brand:** tetra
**Price:** € 99.52
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank by tetra
- **How much does it cost?** € 99.52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/13425518-tetra-whisper-135-gph-internal-power-filter-for-aquariums-fish)

## 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 Design:** Mounts inside the tank allowing flush placement against walls—maximize your desk or living space aesthetics.
- • **Powerful & Efficient:** Air-driven filtration pumps up to 125 gallons per hour, oxygenating water for vibrant, thriving aquatic life.
- • **Effortless Maintenance:** Large Bio-Bag cartridges make filter changes quick and mess-free—because your time is valuable.
- • **Optimized Water Quality:** Dual-sided dense mesh traps debris and fish waste, keeping your aquatic environment pristine and healthy.
- • **Whisper-Quiet Operation:** Submerged motor design ensures near-silent filtration, perfect for peaceful office or home aquariums.

## Overview

The Tetra Whisper Internal Power Filter is a compact, in-tank filtration system designed for aquariums between 10-30 gallons. Featuring a 3-stage filtration process with large Bio-Bag cartridges, it delivers up to 125 gallons per hour of air-driven water flow while oxygenating the tank. Its universal clip mount allows discreet installation inside the aquarium, enabling tanks to sit flush against walls. Known for its whisper-quiet operation and easy maintenance, this filter ensures a clean, healthy aquatic environment with minimal effort.

## 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: Great Budget Filter—Super Easy to Use - I love this filter! It is super easy to set up and works great. I literally just clipped it inside my tank, plugged it in, and it was good to go. It keeps the water crystal clear and is surprisingly quiet as long as you keep your water level up. Perfect for small tanks and anyone who wants a no-fuss setup. Definitely recommend!
Review: Easy Replacement Filter That Got My Fish Tank Back on Track - The pump on my old filter died, and I could immediately tell my fish were not as happy. My 5-gallon tank was also starting to look dirty, so I knew I needed a replacement quickly. I ordered this Tetra water filter and was able to get it overnight. Installation was very easy—the instructions were clear, and I had it up and running without any trouble. I especially love that the replacement cartridge is a simple, single item. My previous filter had three separate replacement pieces that were difficult to keep track of, hard to find, and easy to forget to reorder. I haven’t had this filter for a long time yet, but so far I’m very happy with how easy it was to set up and how well it keeps the tank looking clean and fresh. It’s a straightforward, convenient solution that makes maintaining a fish tank much easier. I would definitely recommend it to anyone needing a reliable replacement filter.

## Features

- INTERNAL POWER FILTER: Tetra Whisper Internal Power Filter for 10- to 30-gallon aquariums uses large Whisper BioBag filter cartridges that are easy to change.
- QUIET 135 GPH MOTOR: The internal pump efficiently filters up to 135 gallons per hour.
- POWERFUL FILTRATION: Water flows through the cartridge floss, trapping debris and fish waste, while Ultra-activated carbon helps remove odor and discoloration.
- SPACE-SAVING DESIGN: Your aquarium can be 1” from the wall with the internal filter designed to clip directly on your aquarium wall and be hidden by décor.
- EASILY ADJUSTABLE: Adjustable clip allows for a variety of setups to easily adjust to high or low water levels.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002DHYG8 |
| Best Sellers Rank | #1,531 in Pet Supplies ( See Top 100 in Pet Supplies ) #2 in Aquarium Filters |
| Brand | Tetra |
| Brand Name | Tetra |
| Color | Black |
| Customer Reviews | 4.3 out of 5 stars 22,453 Reviews |
| EU Spare Part Availability Duration | 1 years |
| Global Trade Identification Number | 00046798258179 |
| Included Components | Aquaria 75025817: Tetra Whisper 20I Internal Filter |
| Item Dimensions L x W x H | 10.2"L x 4.9"W x 10.2"H |
| Item Type Name | Aquarium Filter |
| Item Weight | 1.5 pounds |
| Manufacturer | Tetra |
| Manufacturer Part Number | AQ-65817 |
| Manufacturer Warranty Description | See label |
| Material | 100% Polyester |
| Material Type | 100% Polyester |
| Model Number | 25817 |
| Power Source | Air Powered |
| Product Dimensions | 10.2"L x 4.9"W x 10.2"H |
| Product Style | Submersible |
| Specific Uses For Product | Indoor |
| Style | Submersible |
| UPC | 046798258179 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Tetra
- **Global Trade Identification Number:** 00046798258179
- **Included Components:** Aquaria 75025817: Tetra Whisper 20I Internal Filter
- **Item Weight:** 1.45 Pounds
- **Manufacturer:** Tetra
- **Material:** 100% Polyester
- **Model Name:** Whisper Internal Filter
- **UPC:** 046798258179

## Images

![Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank - Image 1](https://m.media-amazon.com/images/I/81g1VKwt4dL.jpg)

## Available Options

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

## 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

### ⭐⭐⭐⭐⭐ Great Budget Filter—Super Easy to Use
*by R***R on June 17, 2026*

I love this filter! It is super easy to set up and works great. I literally just clipped it inside my tank, plugged it in, and it was good to go. It keeps the water crystal clear and is surprisingly quiet as long as you keep your water level up. Perfect for small tanks and anyone who wants a no-fuss setup. Definitely recommend!

### ⭐⭐⭐⭐⭐ Easy Replacement Filter That Got My Fish Tank Back on Track
*by C***I on July 23, 2026*

The pump on my old filter died, and I could immediately tell my fish were not as happy. My 5-gallon tank was also starting to look dirty, so I knew I needed a replacement quickly. I ordered this Tetra water filter and was able to get it overnight. Installation was very easy—the instructions were clear, and I had it up and running without any trouble. I especially love that the replacement cartridge is a simple, single item. My previous filter had three separate replacement pieces that were difficult to keep track of, hard to find, and easy to forget to reorder. I haven’t had this filter for a long time yet, but so far I’m very happy with how easy it was to set up and how well it keeps the tank looking clean and fresh. It’s a straightforward, convenient solution that makes maintaining a fish tank much easier. I would definitely recommend it to anyone needing a reliable replacement filter.

### ⭐⭐⭐⭐⭐ 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 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)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hr/products/13425518-tetra-whisper-135-gph-internal-power-filter-for-aquariums-fish](https://www.desertcart.hr/products/13425518-tetra-whisper-135-gph-internal-power-filter-for-aquariums-fish)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-31*