Steve,
Those pumps are reasonably priced! I may just give those a try. By the time I replace the impeller in a Mag 7, I'm 2/3 of the way to a new Quiet One 4000 with better performance and I assume quieter. The water flow through the sump must be really fast. I'm not sure my two 1" down pipes can keep up with the flow and water fall in the sump may get loud?
Thanks,
Gary