[Randy Holmes-Farley]

I have an old venturi that came with a skimmer that I bought from Thiel AquaTech 11 years ago. I don't know who made it.

I plan to let the effluent pass through a long column of GAC (a 4" PVC pipe filled with about 12-18" of GAC, the outlet of the HDPE tubing will be about 3 inches below the surface of the GAC).