Mine is plumbed as 3 suction lines (from pool). Two main drains tied to one line, each skimmer on separate line. Two returns (one in deep end, one in shallow). Should have added a return at the stairs to help keep them clean. The advantage of separate skimmer plumbing is that you can better control the suction when vacumming (which I almost never do now thanks to a Pool Rover and Pool Buster).
The returns are the pressure side of the pump, the main drain/skimmers are the suction side of the pump.
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