Quick Q about return pump plumbing

[JRSE7EN]

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!

 

[KStatefan]

That is normal. Your sump needs to be able hold that water.

 

[JRSE7EN]

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.