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 Material Remover, 500 g

Product ID: 2271704

Details

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

💧Reduces ammonia & nitrate for crystal clear water

🧩Complex porous design for max bio surface

⚙️Compatible with 15+ Fluval filter models

¥9327

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧬 Elevate your aquarium’s ecosystem with Fluval BioMax — where science meets crystal-clear perfection!

SUPERIOR WATER CLARITY - Advanced porous structure maximizes contact time, effectively reducing ammonia and nitrate levels for pristine water.
DUAL FRESH SALTWATER USE - Versatile media engineered for both freshwater and marine tanks, supporting diverse aquatic environments.
LONG LASTING COST EFFECTIVE - Durable ceramic granules that outperform polished alternatives, offering exceptional value and sustained filtration.
THRIVING BIO FILTER ECOSYSTEM - Creates an optimal habitat for nitrifying bacteria to rapidly colonize and stabilize water chemistry.
UNIVERSAL FLUVAL COMPATIBILITY - Seamlessly fits Fluval Filter Series 104-406, FX5, FX6, ensuring easy upgrades without hassle.

Fluval BioMax Biological Material Remover is a premium 500g ceramic filter media designed for superior biological filtration. Compatible with over 15 Fluval filter models, it features a complex porous structure that fosters rapid bacterial colonization, effectively reducing ammonia and nitrate levels. Suitable for both freshwater and saltwater aquariums, BioMax ensures crystal-clear water and a healthy environment for fish and plants, making it a must-have for dedicated aquarists seeking reliable, long-lasting filtration.

Specifications

ASIN	B000HHSG5M
ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	#6,562 in Pet Supplies ( See Top 100 in Pet Supplies ) #36 in Aquarium Filter Accessories
Brand Name	Fluval
Customer Reviews	4.8 4.8 out of 5 stars (7,993)
Date First Available	October 15, 2006
Department	Filter Media
Global Trade Identification Number	00015561114561
Included Components	Fluval BioMax (500g)
Item Form	Granules
Item Type Name	Biological Filter Media
Item Weight	1.3 pounds
Item model number	A1456
Liquid Volume	500 ml
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	B000HHSG5M
Model Number	A1456
Number of Items	1
Number of Packs	1
Pet Type	Fish
Product Dimensions	4.5 x 4.5 x 2.6 inches; 1.28 pounds
Target Species	Fish
UPC	015561114561
Unit Count	17.63 Ounce

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