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.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Tetra Whisper 135 GPH Internal Power Filter For Aquariums

Tetra Whisper 135 GPH Internal Power Filter For Aquariums

Product ID: 13425518

Details

Brand
Tetra
Color
Black
EU Spare Part Availability Duration
1 years
Global Trade Identification Number
Item Weight
1.5 pounds
Manufacturer
Tetra

⚡135 GPH motor power

🖤Ultra-activated carbon for odor removal

🧼3-stage filtration system

R2209

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Description

🐟 Silent power, spotless water—filter like a pro!

SPACE SAVVY DESIGN - Mounts inside your tank, letting you place your aquarium just 1” from the wall for a sleek, clutter-free setup.
TRIPLE ACTION CLEAN - BioBag cartridge floss traps debris, while activated carbon eliminates odors and discoloration for crystal-clear water.
SEAMLESS INTEGRATION - Hidden inside your tank and compatible with 10-30 gallon aquariums, it blends perfectly with your décor—no bulky external parts.
EFFORTLESS ADJUSTABILITY - Easily tweak the filter height with adjustable clips to fit any water level or tank setup.
WHISPER QUIET POWERHOUSE - Enjoy powerful 135 GPH filtration without the noise—your aquatic friends will thank you.

The Tetra Whisper 135 GPH Internal Power Filter is a compact, ultra-quiet filtration system designed for 10- to 30-gallon aquariums. Featuring a powerful 135 gallons-per-hour motor and a 3-stage filtration process—including BioBag floss and ultra-activated carbon—it ensures crystal-clear, odor-free water. Its space-saving internal design clips inside the tank, allowing placement just 1 inch from the wall, while adjustable mounting options accommodate various water levels. Ideal for professionals seeking efficient, discreet aquarium maintenance.

Specifications

ASIN	B0002DHYG8
Best Sellers Rank	#1,661 in Pet Supplies ( See Top 100 in Pet Supplies ) #2 in Aquarium Filters
Brand Name	Tetra
Color	Black
Customer Reviews	4.2 4.2 out of 5 stars (22,612)
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 Highlight	For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank
Item Type Name	Aquarium Filter
Item Weight	1.5 pounds
Manufacturer	Tetra
Manufacturer Part Number	AQ-65817
Manufacturer Warranty Description	See label
Material Type	100% Polyester
Model Number	25817
Number of Items	1
Number of Packs	1
Product Style	Submersible
Specific Uses For Product	Indoor
UPC	046798258179
Unit Count	1 Count

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

R2209

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

View all Trustpilot reviews