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 Bio-Max, 500 g

Product ID: 87216453

Details

Brand
Fluval
Item Form
Pellets
Item Weight
1.28 Pounds
Liquid Volume
500
Number of Packs
1

💧No impact on water chemistry

🧬Superior biological filtration

⚖️Replenish half for optimal seeding

€ 132.61

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Description

🧫 Elevate your aquarium’s ecosystem—because your fish deserve the best!

TRUSTED BY THOUSANDS - Join 7,800+ happy aquarists who rate it 4.7 stars for consistent, reliable performance.
WATER CHEMISTRY SAFE - Keeps your tank’s delicate balance intact—no unwanted changes, just crystal-clear water.
EFFORTLESS MAINTENANCE - Pellet form makes dosing simple and mess-free for busy professionals.
SMART SEEDING STRATEGY - Replace only half at a time to maintain a thriving bacterial ecosystem without disruption.
NEXT LEVEL BIO FILTRATION - Harnesses advanced media to supercharge your aquarium’s natural cleaning power.

Fluval Bio-Max 500g is a premium biological filtration media designed to enhance beneficial bacteria growth, ensuring superior water clarity and quality. Its pellet form allows easy partial replacement to maintain optimal bacterial seeding without altering water parameters, making it ideal for professional aquarists seeking reliable, chemical-free filtration.

Specifications

ASIN	B000HHSG5M
Best Sellers Rank	#57,386 in Pet Supplies ( See Top 100 in Pet Supplies ) #582 in Filter Accessories
Brand Name	Fluval
Customer Reviews	4.7 4.7 out of 5 stars (7,811)
Global Trade Identification Number	00015561114561
Item Form	Pellets
Item Weight	1.28 Pounds
Liquid Volume	500 Millilitres
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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€ 132.61

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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