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I ditched my two closed loops with Iwaki 55's and put six Seio 620's in my 220 instead. Much better water movement and much cheaper to run.
2 x Iwaki 55 = ~360W, 1800GPH
6 x Seio 620 = ~48W, 3720+GPH
No comparison and the Seio's don't take up much more room than the return nozzles from the closed loops.
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