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

💧Crystal-clear water clarity

🧬Superior biological filtration

♻️Compatible with 15+ Fluval filters

¥8290

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Description

💧 Elevate your aquarium’s health with Fluval BioMax — where science meets crystal clarity!

ECO FRIENDLY SAFE - Allergen-free media that won’t alter water chemistry, keeping your ecosystem balanced.
UNIVERSAL FLUVAL FIT - Seamlessly compatible with over 15 Fluval filter models, ensuring easy upgrades and replacements.
OPTIMIZED MAINTENANCE - Replace only half monthly to maintain peak biological activity without disruption.
NEXT LEVEL BIO FILTRATION - Complex porous design maximizes beneficial bacteria growth for ammonia & nitrate control.
CRYSTAL CLEAR AQUATIC ENVIRONMENT - Enhances water clarity to create the perfect habitat for thriving fish and plants.

Fluval BioMax Biological Material Remover is a premium 500g biological filter media designed to enhance aquarium water quality by reducing ammonia and nitrate levels. Its advanced porous structure supports optimal bacterial growth, ensuring superior filtration and crystal-clear water. Compatible with a wide range of Fluval filters, BioMax is suitable for both freshwater and saltwater tanks, providing a safe, allergen-free solution that maintains natural water chemistry while promoting a healthy aquatic environment.

Specifications

ASIN	B000HHSG5M
ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	#7,977 in Pet Supplies ( See Top 100 in Pet Supplies ) #49 in Aquarium Filter Accessories
Brand Name	Fluval
Customer Reviews	4.8 4.8 out of 5 stars (8,002)
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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¥8290

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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