How often does these need to be changed i have a 190l tank i.do water changes every 2weeks

Carbon packs are normally recommended to be changed every 4-8 weeks depending on use and cleanliness of aquarium.

Will this fit an Aquaclear 20?

This item is specifically designed for Evo, Spec & Flex filters. We could not say it will 100% work with a different item, even though it may well do.

What size are these? Width & length? Want to use instead of aqua filters

The product - as indicated in the illustration - is contained in 3 sealed package in a box. It actually has the very small size of a grain. I bought mine to clear the water clear in hyacinth bulb glasses. This product is similar to "Eheim Karbon" which I bought for the same purpose. Since I do not have an aquarium, I regret not being able offer an opinion as to whether either of the products I have bought would be appropriate to meet the enquirer's needs. Adrian Clark

will they fit an external 307 filter ?

I just put two bags in my 307 :)

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Fluval Replacement Carbon for Fluval Flex/Spec/Evo - 3 bags,White

Product ID: 49360655

Details

Brand
Fluval
Item form
Granules
Item weight
0.37 Pounds
Liquid volume
34 Litres
Unit count
1 count

🐠Optimized for Fluval Flex, Spec & Evo aquariums

🧊Activated carbon purity for crystal-clear water

♻️3-pack convenience for hassle-free monthly replacement

€ 16.03

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Description

💧 Elevate your aquarium game with flawless water clarity — because your aquatic friends deserve the best!

EFFORTLESS MAINTENANCE - 3-pack design ensures quick, simple monthly replacements to keep your aquarium thriving
TAILORED FILTRATION FIT - Specifically engineered for Fluval Flex, Spec, and Evo tanks to maximize chemical filtration
ODOR DISCOLORATION ELIMINATION - Polishes water by removing dissolved organic compounds that cause cloudiness and smells
CRYSTAL CLEAR AQUATIC ENVIRONMENT - Removes toxins, heavy metals, odors & discoloration for pristine water clarity
HEALTHIER HABITAT FOR AQUATIC LIFE - Supports tropical fish, shrimp, and plants by maintaining optimal water quality

Fluval Replacement Carbon is a premium activated carbon filter pack designed exclusively for Fluval Flex, Spec, and Evo aquariums. Each pack contains 3 bags of high-quality carbon granules that effectively remove pollutants, toxins, heavy metals, odors, and discoloration, ensuring crystal-clear, healthy water. Ideal for monthly replacement, this product supports vibrant aquatic life and reduces maintenance efforts, making it a must-have for any serious aquarium enthusiast.

Specifications

ASIN	B0049RIUWK
Allergen Information	Allergen-Free
Best Sellers Rank	7,556 in Pet Supplies ( See Top 100 in Pet Supplies ) 47 in Aquarium Filter Accessories
Brand Name	Fluval
Country Of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (8,374)
Global Trade Identification Number	00015561113779
Included Components	3x Carbon Filters
Item Form	Granules
Item Highlight	Suitable for Fluval Flex, Spec and Evo Aquariums.
Item Type Name	Fluval Spec/Flex/Evo Replacement Carbon (3 bags)
Item Weight	0.37 Pounds
Liquid Volume	34 Litres
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	A1377
Model Number	A1377
Number of Items	1
Pet Type	Fish
Target Species	Fish
UPC	015561113779
Unit Count	1 count

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€ 16.03

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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