The RC calculator might have a short coming handling a CL with multiple outlets and I think I see what you did. Entering 3/4" for pipe size, calculator restricts the pump outlet to 3/4" where as more likely you'll come of 1.5" then go to a manifold to split.
I looked at the curve also and for 10' head get 1200gph. Take a look at a pressure pump something like an Iwaki RLT series from the reefs.org.
The sump size in itself isn't a problem just having a really high flow could lead to microbubbles and having the lower flow helps detritus settle.
My system is similiar to what you're planning. I have a 145g/75g sump, Dart on CL, inlet 2", connected through a OM 4way going to 4-1" outlets. I'm feeding my basement sump through 2-2" drains (conventional overflows with Dursos) and returning with an Iwaki 70RLT and 1". Off the Iwaki probably getting 1000gph and pump runs a little over 2amp. My thoughts for flow was to rely on the CL for circulation, the flow to the sump really is only to feed the skimmer, heaters and some mechanical filtration.
|