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
168 g
Liquid volume
34 Litres
Number of Packs
3

🧊3 premium carbon bags

♻️replace every 4 weeks

⚗️removes toxins & heavy metals

₪70

Duties & taxes included

In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Elevate your aquarium game with crystal-clear confidence!

HEALTHY HABITAT BOOST - Supports vibrant fish, shrimp, and plants by maintaining toxin-free, balanced water conditions.
EFFORTLESS MAINTENANCE - Convenient 3-pack design allows quick swaps, keeping your aquatic environment fresh with minimal hassle.
TAILORED FIT FOR FLUVAL - Specifically engineered for Fluval Flex, Spec, and Evo tanks ensuring seamless filtration performance.
CRYSTAL CLEAR WATER ALWAYS - Advanced activated carbon eliminates pollutants, odors, and discoloration for pristine aquarium clarity.
OPTIMAL CHEMICAL FILTRATION - Polishes water by adsorbing dissolved organic compounds that cause cloudiness and unwanted smells.

Fluval Replacement Carbon is a premium activated carbon filter pack designed exclusively for Fluval Flex, Spec, and Evo aquariums. Each pack contains 3 bags that efficiently remove dissolved toxins, heavy metals, odors, and discoloration, ensuring cleaner, clearer water. For peak performance, replace every 4 weeks to maintain a healthy aquatic environment for fish, shrimp, and plants.

Specifications

ASIN	B0049RIUWK
Allergen Information	Allergen-Free
Best Sellers Rank	14,206 in Pet Supplies ( See Top 100 in Pet Supplies ) 121 in Aquarium Filter Accessories
Brand Name	Fluval
Customer Reviews	4.6 4.6 out of 5 stars (8,418)
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	168 g
Liquid Volume	34 Litres
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	A1377
Model Number	A1377
Number of Items	1
Number of Packs	3
Pet Type	Fish
Target Species	Fish
UPC	015561113779
Unit Count	1 count

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