[jer77]

So your not interested in making a closed loop? If this amount of flow can even be used do you know the flow through your sump will be like whitewater. This will create tons of microbubbles. You will also be wasting a ton of electricity for the head loss by using your return pump as the main source of flow. Plus is this amount of flow even possible? Since it is RR you have two holes in the bottom which you'd have to use both as drains, but still the max flow you'd be able to get is around 950 gph. This is not enough to provide strong flow through a many output return manifold system.