Biomax (by Fluval) vs Siporax (by Sera) vs Absorbex (by Hobby).
I just tested the in my eyes 3 best types of filter media for absorbtion ability, which leads to the best housing for nitrobacter.
The second part at 3:00 shows the weight in dry/wet condition + the gain in percent.
The green fluid is water mixed with food colour.
The third part will deal with the dimensions.
A resume to all this and what it practically means, or which one is best under certain conditions will follow..
Your are welcome to comment on this.

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