I have a CPR spill over to a cpr wet/dry(that I removed the bail and am using as sump. When I first set it up I got everything running syphon was sucking and little gaint was pumping.. I wanted to adjust a few things so I cut the power thinking that everything would stop. Well the return pump stopped but the syphon didn't 8O . I didn't notice untill a few second later when the sump started to overflow. I got a little wet luckily there was a pile of clean towels(that I was supposed to be folding and not playing with my tank) in the room. I learned 2 things
1. What happens if the power goes out.
2. That I needed to adjust water levels in sump so it would not happen again
I have it now so that if the pump goes out the sump will not flood and if the syphone breaks and the pump empties my sump the tank will not overflow. Sometimes little accidents will teach you how to avoid Big accidents in the future