Understood. I had my cycling processes mixed up.
Also - had our first mini flood today. Yesterday, the Apex alerted that the ATK upper sensor registered water - which shouldn’t happen. I went to look and indeed the top off was dripping, indicating a siphon between the reservoir and the sump. So, I fiddled with the connection from the ATO pump until it broke the siphon and turned off the ATK for the night. This morning, when I turned it back on, the fitting was loose and sprayed water everywhere until I managed to turn it off.
Lessons learned:
If you fiddle with something, make sure it works correctly afterwards. Expect it to fail and be prepared.
Fix the root cause. The root cause was that the siphon hole was not drilled all the way through. By fiddling I stopped the siphon but I didn’t fix the root cause.