Well so did I, I built a closed loop and bought a SCWD and attached it to a Mag drive 950, I thought this would be great... Wrong! So I stop at the LFS
and picked up a Mag 1200 and thought this HAD to be better, NOPE, What the hell is going on I thought I did everything right and NO
pressure. So I went to the SCWD web site and watched the video about 3 or 4 times then it hit me in the head like a ton of bricks. When you build your closed loop you use 3/4 pvc
pipe all the way back to the inlets right? Yes. If you look at the video there inlets are a 1/8 to 3/16 slit ... Same concept as putting your finger over the end of a garden hose,increase pressure.So instead of rebuilding my closed loop here is what I did.Took a propane torch on very low,Heated a 90 degree elbow and closed one end, Well let me tell you,Holy mackeral, Not only is it breaking the suface its creating small vortexes around the tank. Here are a couple of pics...plus I figured if it worked for the closed loop why not the return from the sump, That has a Mag 700. tank 1 pic, That shoots across the back of the tank.