Correct, a union there would be far more useful.
1" provides more flow from that pump, and the SCWD can handle it. Water going in will be cut back by 20% before it comes out. I know you are only talking about 24" of plumbing before the SCWD, but it will help.
I was suggesting putting it behind the tank so you have as straight a shot as possible to the SCWD and shorter return lines into the tank.
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Marc Levenson - member of DFWMAS
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