Return pump question

[golf nut]

You are going to see a fair amount of reduction in flow due to the mechanics of it and then a further reduction because of the 2 tees to each line, you would be far better to run the SCWD as high as possible and start by using 2 feeds only first and then split later once you have seen the results.

always have reductions or interference in plumbing as far away from the source as possible.