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I agree with Poopapotanus, less pumps in the sump seems like a good idea until the extra space of the manifold and valves are weighted.
One thing though about running the GFO when only "needed":
I believe they recommend keeping the GFO tumbling so that it will not solidify. So I do no think it is a good idea to trap water in there and let it sit until you want to run it again- unless you drain it. I have been running a GFO for ~4 years, and I never had it solidify with a ~120L/hr pump until I added a Kalk reactor. Different GFO's work different, I found BRS' to clump and actually seize the whole reactor frequently when the Kalk was added. I just started using KOLAR LABS GFO HIGH CAPACITY, so far it has not clumped, does not float or have the super small grains that can float around and clog sponges and settle in the sump like BRS's.
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