I believe the recommended size pipe for the MAG 18 to achieve full flow is 1 1/2" in and out despite the thread sizes they have. It is kind of decieving. If you want to save the plumbing you have in place, try twinning the return pipe. Two 3/4" lines will approximately equal a single 1". It will improve the flow somewhat, but still not up to maximum.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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