Here is a pic of a Nitrate coil. Basically a coil of tubing inside a cylinder filled with bio-material (balls, nylon pot scrubbers, anything that has surface area for the aerobic bacteria to adhere and grow). The water is pumped through at a drip rate and the anerobic bacteria do their thing. It takes time for it to establish effectiveness, but these things work for a long time. I will post plans in a new thread when I get done!!
Water from tank pumped in tube at top left, down through coil, slowly back up through the material (blue), and back out into the water column ( in my case in the sump, somewhere)
Drew *
