Quick Q about return pump plumbing

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JRSE7EN

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I'm building a tank from scratch but this inquiry has mostly to do with the back pressure of the return pump if the power goes out. Years ago if I cut the power on my return the water would instantly reverse flow into the sump or onto the floor<depending on water level in the tank where it meets the return plumbing> . Was this a fault of my return pump or is this a normal phenomenon? How has technology changed within the past 10 years? If nothing has changed, how would I remedy this issue the CORRECT way? Thanks in advance!
 
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JRSE7EN

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That is normal. Your sump needs to be able hold that water.
The sump will hold it for sure. I wasn't sure if there was an industry wide solution I should look for on newer equipment that would help regulate the sump level in case of power failure. My biggest issue if I can recall from years ago was that the protein skimmer would start back up at a higher level, then completely spew into the sump. Not the end of the world but planning for worst case scenario will hopefully put me ahead.
 
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