A sulfur denitrator? That's been around for a long time. See there are so many options for reducing N&P. Lots of different approaches may yield the results we are looking for.
After going through over 200 dollars worth of pellets I also like the idea of using a regeneratable media like the one I described in my other thread. Not spending so much money will be nice! And dropping 35 ppm in N in 48 hours - I think that's pretty good