Terence are you feeding your Sulfur reactor with a DOS? Is that why your graph is not a smooth ramp? I'm just trying to interpret the data in this graph.Posts like this keep me doing it.
BTW, my ORP keeps dropping. Getting closer to the sweet spot. When I get home from FL I will be checking the Nitrate of the effluent of the Denitrator.
Also I saw in your picture of the Sicce mod to your Deltec CA reactor that you used metal hose clamps. I'm not sure if you've changed that or had issues with that but I had some bad experiences with them on my systems. I just use large nylon zip ties now because I can get them just as tight as the hose clamp and they don't rust or contaminate my system.