This is great! I find it quite interesting. I'm also starting to think that the stuff I added to my filter, biohome ultimate, is doing all 3 processes, too. I saw a (Australian perhaps) man on YouTube who was saying biohome was the best biological and I thought he said it would also remove nitrates. But, I didn't think about that part until now.
I'm headed to check out your page now.
All this info is good! I'm very happy to learn about new products and methods.
Edited: yeah, he did say nitrates, also. 8 minute mark is where he says this: