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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U2 Internal Filter Carbon Cartridge

Product ID: 50313357

Details

Brand
Fluval
Item form
Granules
Item weight
45 g
Manufacturer
Rolf C Hagen
UPC
015561104906

🌊Fresh & saltwater ready

🧪Dual chemical filtration

♻️2-pack convenience

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4.49 OMR

Duties & taxes included

In stock

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Details

Brand
Fluval
Item form
Granules
Item weight
45 g

Description

♻️ Elevate your aquarium’s clarity with Fluval’s powerhouse 2-in-1 filter cartridge!

EFFORTLESS MAINTENANCE - Convenient 2-pack ensures you’re always stocked and ready to refresh your filter.
VERSATILE FOR ANY HABITAT - Perfectly engineered for freshwater, saltwater, and reptile tanks alike.
DUAL ACTION FILTRATION POWER - Polyester side traps fine debris while carbon side eliminates harmful substances.
TRUSTED QUALITY PERFORMANCE - Backed by Fluval’s renowned filtration technology and 4.7-star user satisfaction.
CRYSTAL CLEAR WATER EVERY TIME - Advanced poly-carbon combo removes toxins and odors for pristine aquariums.

The Fluval U2 Internal Filter Carbon Cartridge is a dual-action filtration solution combining polyester and carbon media to effectively remove fine debris, toxins, odors, and colorants. Suitable for freshwater, saltwater, and reptile tanks, this convenient 2-pack ensures consistent water clarity and healthier aquatic environments, trusted by thousands with a 4.7-star rating.

Specifications

ASIN	B001XRR3YA
Best Sellers Rank	2,931 in Pet Supplies ( See Top 100 in Pet Supplies ) 8 in Aquarium Filter Accessories
Brand Name	Fluval
Country Of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (2,487)
Global Trade Identification Number	00015561104906
Item Form	Granules
Item Type Name	U2 Poly/Carbon Cartridge (2pcs)
Item Weight	45 g
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	A490
Model Number	A490
Target Species	Turtle
UPC	015561104906
Unit Count	1.0 Count

Reviews

M**K

Well priced

Excellent product and reasonable price 👌

25.08.2025

T**A

Filter

Works well

23.06.2025

W**.

Fluval

Good quality and competitive price

29.12.2024

D**I

Brilliant

Well known make; always very good

13.03.2026

A**R

Done the job

Done the

8.09.2025

T**E

Great

19.08.2025

J**N

Kept the water clean

Got one from a pet shop and with in 24 hours it was blocked for no reason, sort refused a return so i brought this and ive had it in my tank since, cleaned it with tank water and its good for another few months. Fast delivery and good price.

27.06.2023

N**R

As Described

Size was perfect.

9.06.2025

R**E

schnelle Lieferung

27.11.2025

B**E

Conforme à mes attentes. Filtre aquarium fluvial U2

1.11.2020

H**N

Snel geleverd en redelijk betaalbare navulling voor filtercartridge met active kool. Prima en origineel betrouwbaar.

3.01.2026

S**K

Work well not a bad price

12.01.2026

Q**N

très efficace

20.08.2020

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