The pumps can run dry for several seconds with out a problem, especially when you are pumping water through them to start with. there will be enough residual water in the pump head to protect the impeller. My first march pump if 7-8 years old now and has not had a problem, and I run it for a while some times after the hlt runs dry( the response time with the BCS controller is a few seconds from telling the system to stop and before it will shut down power to the pump). You really just don't want to run it for extended periods of time with out any liquid running through the head at all.
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