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Hello, Can someone help me figure out the correct position for the Jandy valves that connect the "main drain" to the "main drain return"? Both of these lines are connected together and I'm not sure why? I typically allow the main drain to be drawn into the pump (as shown in the picture) but in...

Reading through these forums its been mentioned to use Schedule 40 PVC and avoid DWV for above ground pool plumbing. But what if something is both DWV and Schedule 40 (see links bellow)? Could these be used...