I run 3 lines off my return (not on purpose but the biulder drilled too many holes) 2 of the return lines are on Wavyseas and the 3rd is just straight. I then have a closed loops system with a Ocean motion 4-way. the 4-way runs; left and right side of the tank open together (2 outputs per side) then top front and bottom rear open together (4 outputs per).
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