Has anyone made their own pumping column? I am trying to recirculate my dwc buckets and I used this 1/2 fitting with a 1/4 nipple coming out the side kinda like a tee. I'm just having trouble getting a steady flow of water, alittle bit come out then it kinda bubbles the alittle more comes out. I was wondering what the diameter of the GH pumping colunm is? Or if anyone had any ideas. Thanks