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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BioMax Biological Material Remover, 500 g - Biological Filter Media for Aquariums

Product ID: 254517415

Details

Brand
Fluval
Item form
Granules
Item weight
0.57 Kilograms
Liquid volume
500
Manufacturer
Rolf C. Hagen

💧Crystal clear water clarity

🧬Superior biological filtration

♻️Compatible with 15+ Fluval filters

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$51.83

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Description

🧪 Elevate your aquarium’s ecosystem with Fluval BioMax — where science meets crystal clarity!

UNIVERSAL FILTER FIT - Seamlessly integrates with over 15 Fluval filter models, ensuring hassle-free upgrades and replacements.
FRESH SALTWATER READY - Engineered for versatility, perfect for both freshwater and saltwater tanks to keep your ecosystem thriving.
NEXT LEVEL WATER PURITY - BioMax’s advanced porous granules optimize ammonia & nitrate reduction for a pristine aquatic environment.
SMART MEDIA REPLACEMENT - Replace only half at a time monthly to maintain optimal bacterial seeding and continuous filtration power.
SUSTAINED BIOLOGICAL BALANCE - Promotes healthy nitrogen cycles without altering water chemistry—your fish and plants will thank you.

Fluval BioMax is a premium biological filter media designed to enhance aquarium water quality by efficiently reducing ammonia and nitrate levels. Compatible with a wide range of Fluval filters, its porous granules support optimal bacterial growth for sustained nitrogen cycling. Suitable for both freshwater and saltwater tanks, BioMax ensures crystal clear water without altering water chemistry, making it an essential upgrade for any serious aquarist.

Specifications

ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	#18,711 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,020 in Aquarium Accessories
Brand	Fluval
Brand Name	Fluval
Customer Reviews	4.7 out of 5 stars 8,297 Reviews
Global Trade Identification Number	00015561114561
Included Components	Fluval BioMax (500g)
Item Form	Granules
Item Type Name	Biological Filter Media
Item Weight	0.57 Kilograms
Item form	Granules
Item weight	0.57 Kilograms
Liquid Volume	500 Milliliters
Liquid volume	500 Milliliters
Manufacturer	Rolf C. Hagen (USA) Corp.
Pet Type	Fish
Target Species	Fish
UPC	015561114561
Unit Count	17.63 Grams

Reviews

S**N

geweldig

deftige kwaliteit zeker en vast

15.07.2025

B**X

Good

8.11.2025

S**A

Amazing Quality

13.11.2019

M**K

Best ceramic rings I could buy on-line and in shops in Delhi

30.06.2018

D**J

Works like a champ and last a long time

29.10.2024

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