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I have an old 40 x 20 (deep), in ground pool. I estimate it at +/- 40,000 gallons. It has a 1.5 inch main drain line and a 1.5 inch skimmer line on the suction side. On the return side, it has just one 1.5 inch return (I am going to convert an unused 1 inch pressure cleaner line to an...