Neal, one thing that I'm doing with my denitrator as I wait for it to cycle, is testing the output NO3 and NO2. Maybe you'd like to do something similar with this unit of yours, just to get an idea of how fast (or slow) it really takes to cycle in. And measure your effluent rate in terms of ml/min and stuff like that.
Nice simple design, I'm tempted to try one as well (would be nice to do a comparison to the sulfur denitrator side-by-side).
PS. We could start a collection for a pedicure
