It's my first time, Do I replace both at the same time or will it cause my tank to go through a mini cycle? Are useful bacteria colonising in these?

No, only change one and after two weeks change the other one, don't change the foam pads just rinse them out with aquarium water . Yes good bacteria is in the pads

Do I have to remove these cartridges from the filter before using medication treatment?

Some treatments advise the removal of Carbon used as a filter media simply because it will absorb the treatment from the water before it can do any good. The filter should run okay to keep the water circulating without the cartridge fitted. A good reason to read up on treatments before use.

Does this help reduce nitrates?

No. It is just a poly fiber filter for particulates, and a carbon filter for organics.

As you replace the filter, it’s sponge then the filter. It the carbon of the white side uppermost. Very confused.

Yes, sponge then the filter. Filter - black side on the outside. Hope it helps 😊

Desertcart Logo

Deliver to Ecuador

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

Description

🧼 Elevate your aquarium’s vibe with crystal-clear confidence!

VALUE PACKED CONVENIENCE - Includes two cartridges per pack, ensuring continuous premium filtration without interruption.
COMPACT LIGHTWEIGHT DESIGN - Slim 6.35 x 6.35 x 3.3 cm cartridge fits seamlessly inside your Fluval U2 filter without bulk.
DUAL ACTION FILTRATION POWER - Combines polyester mechanical and activated carbon chemical filtration for spotless, toxin-free water.
ODOR CONTAMINANT ELIMINATOR - Effectively removes harmful substances, colorants, and odors to keep your tank pristine and inviting.
VERSATILE AQUARIUM COMPATIBILITY - Perfectly engineered for freshwater, saltwater, and reptile tanks—one cartridge fits all your aquatic needs.

The Fluval U2 Internal Filter Carbon Cartridge is a dual-action filtration media combining polyester mechanical and activated carbon chemical filtration. Designed for freshwater, saltwater, and reptile tanks, it efficiently removes odors, toxins, and fine debris to maintain crystal-clear water. Compact and lightweight, it fits perfectly in Fluval U2 filters and comes in a convenient 2-pack for uninterrupted aquarium care.

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.

$35.49

Duties & taxes incl.

Ecuadorstore

Free Returns

30 daysfor PRO membership users

15 dayswithout membership

Secure Transaction

ChatGPT - opens in a new tab Perplexity - opens in a new tab Claude - opens in a new tab Grok - opens in a new tab Google AI - opens in a new tab

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

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

1 month ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

View all Trustpilot reviews

Pet Type	Fish
Product Dimensions	6.35 x 6.35 x 3.3 cm; 45.36 g
Item model number	A490
Item Form	Granules
Size	2.4 x 0.6 x 3.4 cm
Number of Items	1
Quantity	1
Compatible Devices	Refrigerator
Special features	Effective chemical filtration
Batteries required	No
Batteries Included	No
Item Weight	45.4 g

FluvalU2 Internal Filter Carbon Cartridge

Details

Description

Specifications

Have a Question? See What Others Asked

Common Questions