I am not familiar enough with the MCP600 to make that call. Many centrifugal pumps free flow easily...someone else here may know. Bill has done enough work with these that I bet he knows...
It could be hard to tell if a pump is not running when two are in series...just a thought.
These ideas (and your original questions) are acutally pretty common here and all have been answered extensively in varoius threads.
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