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.

Bio Max 500 G | Desertcart UK

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Description

🦠 Elevate your aquarium’s ecosystem with Fluval Bio-Max — where science meets crystal-clear water!

COMPACT EFFICIENT - 500g pellet form fits seamlessly into your filter, maximizing surface area for bacteria growth.
TRUSTED BRAND QUALITY - From Rolf C. Hagen, a leader in aquatic care, ensuring reliability and performance.
SMART SEEDING STRATEGY - Replace only half at a time to maintain a thriving bacterial colony and avoid filtration downtime.
WATER CHEMISTRY FRIENDLY - Keeps your aquarium’s delicate balance intact—no unwanted shifts in pH or hardness.
NEXT LEVEL FILTRATION POWER - Harnesses advanced bio-media to supercharge your aquarium’s natural filtration system.

Fluval Bio-Max is a 500g pellet-based biological filtration media designed to enhance aquarium water quality by promoting beneficial bacterial growth. It supports superior filtration without altering water chemistry and recommends partial media replacement to maintain optimal seeding. Manufactured by Rolf C. Hagen, it fits standard canister filters and ensures a healthy, balanced aquatic environment.

Specifications

ASIN	B000HHSG5M
Best Sellers Rank	#57,075 in Pet Supplies ( See Top 100 in Pet Supplies ) #617 in Filter Accessories
Brand	Fluval
Brand Name	Fluval
Customer Reviews	4.7 out of 5 stars 7,715 Reviews
Global Trade Identification Number	00015561114561
Item Form	Pellets
Item Weight	0.57 Kilograms
Liquid Volume	500 Millilitres
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	B000HHSG5M
Model Number	A1456
Net Quantity	1 Count
Target Species	Fish
UPC	015561114561
Unit Count	1 Count

Reviews

S**A

13.11.2019

J**R

2.11.2018

S**H

19.09.2014

K**H

27.04.2018

S**N

15.07.2025

A**L

29.11.2019

D**J

29.10.2024

M**K

5.10.2025

S**A

3.01.2025

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