Thanks for the reply Reed! I've thought about that. I guess I thought it would be ok, because since it is a closed loop, that the water would return almost instantly, and wouldn't cause that big of an issue. The only potential issue I see is that, if the CL pumps are flowing way too much, then it could starve the sump. My logic behind that is that the water level in the overflow may drop below the sump drain.
I plan on running the two little giant pumps for the closed loop (~1100gph x2 = 2000gph not including head loss). Maybe 1800gph. The sump retun pump is about 1500gph not including head loss. Maybe an issue?
Only reason I picked to put the CL input with the overflow, is because of aesthetics and to keep objects from getting sucked into it. How do people normally filter out the the CL input? a screen? does anybody else see an issue with placing the CL input with the overflow?
Thanks!