Is my math correct? 135x50=6750 gph?

dwdenny: I thought I read that you had 28x plus another 786gph for the close loop. That still sounds like a lot to me, but clearly I'm wrong!!!

How can I judge the amount actually going to the tank from my dart?

plumbing:
Sequance Dart @ 60" head pressure should run ~2700gph
60¾" to water level from pump level
1.5" PVC pipe from pump to manifold
2 90°'s
1 ball valve at a little over 50% restricted (~60°)
manifold is 1" PVC with 6 3/4" loc-line outs

Just before the ball valve there is a tee to the skimmer... it is reduced to 1" and is running wide open. I'm sure the skimmer is getting a great deal of the water the pump has to offer, but I don't know how to judge it.

changes since this picture include adding a ball valve just after the flex tube to the skimmer and cutting the ball valve to the tank down another 10-20° (clockwise)


Maybe a tunze system isn't such an expense after all, but I sure would like to have some directional flow from that manifold... right now it barely blows the polyps on my devils hand and thats about 4" away from one outlet