its been running for around 3 weeks,
at 1st it took less than 1 week to drop to 25ppm, din know the last 25ppm is so tough, anyway last nite spent a few hours tuning again, looks like i managed to increase the flow to a slow trickle and its still maintaining non detectable no2 and no3 from the output , but once the no3 from the main tank water is reduce to undetectable . the food source (nitrate) will be minimal, so what should the next step of the denitrator be? take out half the beads and store it? or just leave it running as it is?