My new sulphur denitrator setup

[Delphinus]

Ah, I see. It is an interesting looking media. I haven't found mine to have clogging issues in 8 weeks yet but I can see how the rounded stuff would be better. The only thing is for me 8 weeks in and I can't get it to produce zero NO3 no matter what I try. My last thought is that the tank has a bad microbubble problem, maybe I just have too much dissolved oxygen in the tank water. Since it seems to be an insurmountable issue and nobody can tell me what's wrong with with mine, I'm probably going to take mine offline. No sense in paying for the electricity to run the pump if it's not doing anything. Disappointing on the one hand but on the other hand I'm glad yours is working out for you. Means that it can work.