Ok, I am no fluid dynamics engineer, so I am totally confused about what to do for returns from the 1" PVC coming out of my overflow. I have a 1-1/2" drain line with just a couple 90s....manufacturer says its rated for 1600 gph max. I have 1" return PVC with a Pan World Pump rated for 2000 gph. I have about 4 90s and 2 45s, a couple true union valves, and about 6' of static height. I also have a T off the return, feeding a small amount of water to the refugium...valve ...
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