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You hit the nail on the head - I'm in Phoenix, and tank temperatures can sometime be a challenge. So I've always run my return pumps externally. This particular tank is in the front lobby of our office, and is right in front of a West-facing window. So the potential for additional heat is definitely something we will want to minimizeWhy chose the L-shape sump and not have the return pump be submersed in a return chamber - making the sump traditional rectangle/square? two simple reasons come to mind - heat dissipation of the return pump to the room vs to the water (if overheating tank is something to worry about, any heat transfer source removed helps); and dry maintenance/servicing of all 3 pumps?
are there any other reasons?
Beyond that - it's mostly preference, I just like the look of it, and I prefer the maintenance on a dry pump, vs one that's been sitting in the sump for few months (or longer)
As for the L-shaped sump, - I am trying to maximize the size of the sump while still having space for other equipment under the tank. Other than that, I really just kind of like the idea of the L-shaped sump because it's different.