How often should these be changed? I have two Fluval filters, 105, 305 on a 40 gallon breeder tank (used for a turtle and guppies only).

Unless it completely breaks down and crumbles, never. Do not wash in the sink or with tap water as it will kill the bacteria which is the entire point of these. If clogged with physical detritus just shake them loosely in aquarium water in your aquarium safe bucket you use for water changes or cleaning and reuse. They only say to replace so they can make $$$.

Out of one box which is about 18 ounces, how many gallons of water would this be good for? Simply because I have a 55gal aqaurium

Biological media doesn't go by gallons, I understand it seems like it should, but if your tank is cycled or in the process of cycling this just makes a safe place for that bacteria to live, you'd be fine with one box due to the super high surface area of these rings, but you can always add more if you have space for them, your tank being fully cycled is what really matters.

How good is the Surface Area for these? More rough=more SA.

They have worked well for my aquarium - still in use - they have a textured surface to hold - I like the product

Would this filter media work if I put it in a mesh pouch and hang it in the tank? I have a light source so not sure if this would make algae grow

Yes but not as efficiently. Bacteria can easily colonize these rings in a filter because so much waste passes through them. When you just hang it in the tank its like adding extra gravel which the bacteria also colonize but to a lesser degree.

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Fluval BioMax Biological Media Remover for Aquarium Filters, 500g

Product ID: 2271704

Details

Brand
Fluval
Item Form
Granules
Item Weight
1.3 pounds
Liquid Volume
500 ml
Number of Packs
1

💧Crystal clear water clarity

🧬Superior biological filtration

♻️Optimized porous design for max contact

€ 64.21

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Description

♻️ Elevate your aquarium’s ecosystem with Fluval BioMax – where science meets crystal clarity!

UNIVERSAL COMPATIBILITY - Seamlessly fits Fluval Filter Series 104-406 & FX5/FX6 models for versatile use.
NEXT LEVEL BIO FILTRATION - Advanced porous media boosts beneficial bacteria growth to reduce ammonia & nitrites effectively.
SALTWATER FRESHWATER READY - Engineered for both environments, ensuring consistent performance no matter your tank type.
SUSTAINABLE SMART MAINTENANCE - Replace only half monthly to maintain biological balance without disrupting your ecosystem.
CRYSTAL CLEAR AQUATIC ENVIRONMENT - Transforms your tank water into pristine clarity, creating the perfect habitat for fish and plants.

Fluval BioMax is a premium biological filter media designed to enhance aquarium water quality by promoting beneficial bacteria growth that reduces harmful ammonia and nitrite levels. Compatible with a wide range of Fluval filters, its complex porous structure maximizes water contact time for superior filtration, suitable for both freshwater and saltwater tanks. Regular partial replacement ensures sustained biological balance without altering water chemistry.

Specifications

ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	#8,962 in Pet Supplies ( See Top 100 in Pet Supplies ) #49 in Aquarium Filter Accessories
Brand	Fluval
Brand Name	Fluval
Customer Reviews	4.8 out of 5 stars 8,024 Reviews
Global Trade Identification Number	00015561114561
Included Components	Fluval BioMax (500g)
Item Form	Granules
Item Highlight	Bio Media - Biological Filter Media for Aquarium Filters - Freshwater & Saltwater - Complex Porous Design
Item Type Name	Biological Filter Media
Item Weight	1.3 pounds
Liquid Volume	500 ml
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	B000HHSG5M
Model Number	A1456
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	015561114561
Unit Count	1 Count

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€ 64.21

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Excellent communication throughout the order process. Product is perfect.

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