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 - Biological Filter Media for Aquariums

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

Product ID: 2271704

Details

Brand
Fluval
Item Form
Granules
Item Weight
0.57 Kilograms
Liquid Volume
500
Manufacturer
Rolf C. Hagen

🌊compatible with 15+ Fluval filters

🧩500g premium bio media

♻️complex porous design

184.22 DT

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Description

♻️ Elevate your aquarium’s ecosystem with Fluval BioMax — clarity that commands attention!

FRESH SALTWATER READY - Perfectly engineered for both freshwater and marine aquariums.
SUSTAINABLE MAINTENANCE - Replace half monthly to maintain peak biological efficiency without disruption.
UNIVERSAL COMPATIBILITY - Seamlessly fits Fluval Filter Series 104 to FX6 for versatile use.
OPTIMIZED POROUS STRUCTURE - Ensures ideal water flow and contact time for thriving bioactivity.
SUPERIOR BIOLOGICAL FILTRATION - Maximize ammonia & nitrate reduction for crystal-clear water.

Fluval BioMax is a 500g premium biological filter media designed to enhance aquarium water quality by efficiently reducing ammonia and nitrate levels. Its complex porous structure optimizes water flow and biological activity, compatible with over 15 Fluval filter models, and suitable for both freshwater and saltwater tanks. Regular partial replacement ensures sustained filtration performance without altering water chemistry.

Specifications

ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	#6,383 in Pet Supplies ( See Top 100 in Pet Supplies ) #32 in Aquarium Filter Accessories
Brand	Fluval
Brand Name	Fluval
Customer Reviews	4.8 out of 5 stars 7,968 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
Liquid Volume	500 Milliliters
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	B000HHSG5M
Model Number	A1456
Pet Type	Fish
Target Species	Fish
UPC	015561114561
Unit Count	17.63 Ounce

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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184.22 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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