A 1" drain will dump approximately approximately 600gph into your sump. If you have two of these going into a skimmer section then you are adding around 1200gph into your sump and only pumping out around 700gph at most back into your display. If this is the case then you would need to out hate valves on your drains to limit the amount of water draining to your sump and to match the flow of the return pump to your DT.
If your pump is draining your sump too fast then you would need to put a ball/gate valve on the exit side of your return pump to limit the amour of water being removed from your sump to match the flow rate of the drain line.
Hope that makes sense,
Dunc
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