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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💧 Elevate your aquarium game with crystal-clear confidence!

POROUS POWERHOUSE - Complex structure maximizes beneficial bacteria growth
DUAL ENVIRONMENT READY - Perfect for both freshwater and saltwater tanks
EASY MAINTENANCE ROUTINE - Replace half monthly to keep your tank pristine
NEXT LEVEL AQUARIUM HEALTH - Reduces ammonia & nitrate for a thriving aquatic ecosystem
UNIVERSAL FILTER COMPATIBILITY - Seamlessly fits Fluval 100-400 series & FX models

Fluval BioMax is a premium biological filter media designed to enhance aquarium water quality by reducing harmful ammonia and nitrate levels. Compatible with a wide range of Fluval filters, its advanced porous structure promotes beneficial bacteria growth, ensuring a healthy environment for both freshwater and saltwater tanks. Regular partial replacement maintains optimal filtration without altering water chemistry.

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Pet Type	Dog
Product Dimensions	11.43 x 11.43 x 6.6 cm; 570 g
Manufacturer recommended age	1 month and up
Item model number	A1456
Breed Recommendation	Small
Pet Life Stage	All Life Stages
Flavor	Flavorless
Item Form	Granules
Allergen Information	Allergen-Free
Color	BioMax
Size	500 g
Number of Items	1
Quantity	1
Special Features	Waterproof
Specific Uses	Indoor
batteries required	No
Batteries Included	No
Item Weight	570 g

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

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