What size replacement filter cartridge for this unit...small, med?

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.

Where can I just get the Bioscrubber?

Hello. You can get it at a pet store, amazon has some, grocery stores with a pet section...they are pretty easy to find.

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

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 :(

Would this filter be too strong for a Betta in a 10 gallon tank?

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.

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🐠 Elevate your aquarium game with whisper-quiet, powerful filtration!

SPACE SAVVY FLUSH MOUNT - Mounts inside the tank allowing aquarium placement flush against walls—maximize your room’s style and space.
WHISPER QUIET EFFICIENCY - Submersible internal filter runs silently, perfect for your home office or living space.
EASY BIO BAG CARTRIDGE SWAP - Medium-sized cartridges are a breeze to replace monthly, keeping maintenance hassle-free and your fish thriving.
TRIPLE STAGE FILTRATION POWER - Combines Ultra-Activated® carbon, dual-sided Bio-Bag® mesh, and air-driven water flow for crystal-clear, odor-free water.
OXYGEN RICH AQUATIC ENVIRONMENT - Integrated air pump bubbles oxygen into water, promoting healthier fish and vibrant aquatic life.

The Tetra Whisper 10i Internal Power Filter is a sleek, in-tank filtration system designed for 3-10 gallon aquariums. It delivers up to 80 gallons per hour of quiet, efficient water filtration and oxygenation through a unique air pump-driven design. Featuring a triple-stage filter with Ultra-Activated® carbon and dual-sided Bio-Bag® mesh, it traps debris and eliminates odors while allowing your tank to sit flush against any wall. Ideal for millennial professionals seeking low-maintenance, high-performance aquarium care.

Reviews

D**R

not suitable for uk 240v

this as an americanfilter with a 110 v pump. uk is 240v. pump breaks fast when plugged in to uk mains. why is this advertised in uk

24.02.2025

C**A

Broke down within hours of plugging in

The pump stopped working after 6 hours of being plugged in, came with a European plug on it. Brought a new adapter plug thinking it maybe my old one was the problem and still didn't work. £30 wasted, thank goodness my fish survived.

9.06.2024

S**R

Broken the next day

It was broken the next day, not good for the tank with lids

6.07.2023

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Pet Type	Aquatics, Aquatics Filtration, Aquatics Filtration Internal Filters, PetSupplies
Product Dimensions	10.8 x 10.16 x 20.32 cm; 476.27 g
Item model number	25816
Pet Life Stage	All Life Stages
Flavor	Flavorless
Item Form	Power
Allergen Information	Gelatin Free
Colour	Black
Size	5 - 10 Gallons
Volume	5 Litres
Number of Items	1
Quantity	1
Care Instructions	Clean impeller yearly
Specific Uses	Active
Batteries required	No
Batteries Included	No
Item Weight	476 g

Tetra Whisper Internal Power Filter 5 To 10 Gallons, For aquariums, In-Tank Filtration With Air Pump, Black

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