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    Transitioning from old copper to plastic sizing question

    I've got an old Anthony swimming pool with 1 1/2" copper from the pool and 1 1/4" back to the pool. About 10 years ago I cut into the copper and transitioned to 1 1/2" PVC where I could when I installed a new WFE-3 pump and DE 48 sq. filter. I'm looking to go to the Intelliflo I1 to save...