Help with water changes, ATO and patience :)

[Reef Pilot]

Originally Posted by MarkoD

what if ATO fails and you flood your tank with RO water?

I have a double float on my ATO. If the first one fails for any reason, the 2nd one higher up, will stop the flow entirely.

Is that the only concern? I was wondering if the RO/DI water needed to be aged or something before going directly into the sump, similar to when mixing salt water prior to a water change.