My to cents... from my experience.
The Midwest reactors are not the ideal setup. Sulfur pellets don't have enough specific surface to colonize enough bacteria. I would recommend filling the reactor 2/3 with Seachem matrix media and 1/3 with sulfur. The sulfur will last for 6-12 months and if separated well from matrix it can be added without disturbing the matrix.
I have set up one (my design build) in September and controlling with an ORP is a breeze.
I can detail more if needed.
Yes - more detail PLEASE. Sounds very interesting to me! I have some concern that about the Matrix media - in this application....I am assuming it breaks down from the de-nitrification? And, if so, what does it release? IIRC - one of the reasons sulfur works is that it is not broken down chemically from the action of the bacteria.
Can you, or anyone else please elaborate on this"?
Thanks,
T
cheers,
MaLi