Hello; Well yes to back up the claim that up to 20% of the detritus that is squeezed out of dirty filter material is made up of the bb. You made the claim. That claim does not fit with the current understanding about the bb that we all try to get established in a tank. I used a source to back up my understanding that the bb make a sticky film that attaches them to surfaces.LOL you need written documents to prove there is BB in the detritus from an aquarium filter???
I fear your claim may not be correct based on my current understanding of bb. If the claim is backed up by some sort of evidence then it becomes easier to accept.
