Nitrate will not go down...

[monocus]

i just finished building 2 of them.i won't really know if they are working properly for a couple of weeks.i used 2 ' of 3" pvc pipe,drilled 2 -1/4 " holes on the top for an inlet and outlet and 50' of 1/4" tubing(you don't quite need it all)after a time of coiling the tubing in the pvc(takes time and patience as well as a few attempts without pinching the damn tubing) ,i stuffed it with 10 plastic pot scrubbers bought from the dollar store.the end of the tubing leading from the top i put a micro ball valve to control the flow,and the other hole i stuck in 3' of tubing about a 1/2" in to drain back to my tank.for the next 2 weeks i'm dripping about 2 drips per second and will slowly increase over the next couple of months