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 😊

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🧼 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.

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€ 17.24

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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

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