Sump without power

[LoneStarReef]

In the event of a power outage, I plan on having a battery backup for one of my powerheads to keep flow going in my main display. However, this doesn't do anything for my sump. How long can a sump go without power?

 

[Crabs McJones]

What do you all have in your sump?

 

[LoneStarReef]

Nothing yet (building a 90 gallon). Plan on having some live rock rubble for the downflow and some live sand/miracle mud mix in refugium as well as macro algae. Sump will be around 30 gallons.

 

[Marlon2024]

Stick a power head in there with a battery back up