Does this fit the fluval 13.5 gallon evo?

I use it with a 9 gallon fluval tank. It works.

i have Top Fin filter on my 20 gallon tank , well i really dont know where do i place this carbon ?

Carbon should be the last thing the water touches before returning to the tank with the exception of a polishing pad. This is so ammonia and nitrite can be processed by the food bacteria before the carbon leeches it out of the water. Each filter is different so look at how the water flows in your filter for best placement.

How often does the foam filter need to be replaced?

For the health of your fish you should replace the mechanical filter, the foamy thing, at LEAST every 2 months. This isn’t a sweater that you wear and replace when it’s worn out. Who ever gave that advice doesn’t know their @$$ from a hole in the ground.

Is it possible to cut a third opening in the middle for an additional biomax bag?

Yes you could but that would mean you would have very little mechanical filtration. There won't be enough media left to filter anything.

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Fluval Spec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black

Fluval Spec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black

Product ID: 256602740

Details

Brand
Fluval
Item form
Granules
Item weight
5.82 Ounces
Liquid volume
34 Liters
Number of Packs
3

✨Creates crystal clear, sparkling water

💧Removes heavy metals & pollutants

⚗️Research-grade carbon for max adsorption

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R347

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

✨ Elevate your aquarium’s clarity game — because your fish deserve the best! 🐠

TRUSTED LEGACY BRAND - From Fluval, pioneers in aquarium innovation since 1975
TRIPLE PACK CONVENIENCE - Three replacement carbon inserts to keep your aquarium fresh longer
PREMIUM CHEMICAL FILTRATION - Eliminates odors, discolorations & toxins for pristine water clarity
VAST SURFACE AREA TECHNOLOGY - Maximizes impurity absorption for healthier aquatic environments
TAILORED FIT FOR FLUVAL SERIES - Specifically engineered for Spec, Evo & Flex aquariums ensuring seamless compatibility

Fluval Spec/Evo/Flex Activated Carbon is a premium, research-grade chemical filter media designed specifically for Fluval’s Spec, Evo, and Flex aquarium series. This 3-pack of activated carbon inserts effectively removes heavy metals, odors, discolorations, and pollutants, delivering crystal clear, sparkling water. Trusted by over 14,000 users with a 4.6-star rating, it combines advanced surface area technology with Fluval’s legacy of innovation to keep your aquatic environment pristine and healthy.

Specifications

Allergen Information	Nut Free
Asin	B0049RIUWK
Best Sellers Rank	#11,781 in Pet Supplies (See Top 100 in Pet Supplies) #577 in Aquarium Accessories
Brand Name	Fluval
Customer Reviews	4.6 4.6 out of 5 stars (8,246) 4.6 out of 5 stars
Global Trade Identification Number	00015561113779
Included Components	Fluval Spec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black
Item Form	Granules
Item Type Name	Fluval Spec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black
Item Weight	5.82 Ounces
Liquid Volume	34 Liters
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	A1377
Model Number	A1377
Pet Type	Fish
Target Species	Fish
Unit Count	3 Count
Upc	015561113779

Reviews

User

Good product. Speedy delivery

Good product for the aquarium’s water quality.

26.12.2022

User

Beklentimi karşıladı

Fluval 34l akvaryumdaki karbon filtre ömrü dolduğu için aldım. Hem fiyat çok uygun hem de görevini iyi bir şekilde yapıyor.

29.08.2024

User

Small bags so check the details

Very good but smaller than required. In other words I didn't read the details properly so I made the mistake not the seller. However, they are still being used.

16.06.2026

User

Consiglio è davvero un buon prodotto

Efficacia di Purificazione SuperioreLa formula, descritta come "specie bersaglio polvere" (probabilmente carboni attivi di alta qualità in polvere compressa o granuli fini), è estremamente efficace nella rimozione delle impurità.Acqua Inodore: Se notate un leggero odore "stagnante" o sgradevole nella vostra vasca, questo carbone lo elimina completamente in poche ore, lasciando l'acqua inodore e fresca.Rimozione di Tinture e Odori: Perfetto per neutralizzare residui di farmaci dopo un trattamento, o per rimuovere il leggero ingiallimento (tintura) causato da legni o torba. L'acqua torna ad essere limpida e cristallina.Sicurezza per i Pesci: L'azione di purificazione mirata è delicata sui pesci (specie bersaglio pesce) e non altera i parametri essenziali come il pH (a meno che non sia specificamente formulato per farlo, ma il carbone standard è neutro). I miei pesci sono visibilmente più a loro agio in un ambiente privo di sostanze chimiche indesiderate.✅ Praticità e DurataI 168 grammi sono una quantità ideale per un ciclo di pulizia standard (solitamente 2-4 settimane, a seconda delle dimensioni della vasca).Facile da Usare: L'inserto si adatta perfettamente alla maggior parte dei filtri esterni e interni. È sufficiente posizionarlo nell'ultimo scomparto del filtro per un'azione immediata.Potente Assorbimento: La sua struttura porosa e il formato in polvere/granuli fini garantiscono una superficie di contatto massimizzata, consentendo al carbone di assorbire una maggiore quantità di inquinanti rispetto ai formati più grossolani.In sintesi, per chi cerca un'acqua impeccabile e vuole assicurare ai propri pesci un ambiente privo di odori, colorazioni indesiderate e residui chimici, questo inserto ai carboni attivi è un prodotto di altissima qualità. Consigliatissimo!

29.11.2025

User

Exactly as advertised

Perfect exactly as advertised

1.12.2025

User

Très bon produit pour filtration

Reçu rapidement j'ai installé dans mes filtres piscine. J'avais qq doutes, mais c'est très efficace, j'en suis impressionnée.

14.08.2025

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