Just wanted to share with all of you a situation that happened to me the other night. Our utility company had a (scheduled power outage) And I had a small mess/flood. I use an overflow box Utube design. I have never had a problem with it losing siphon and it did not in this case either. The problem I had was my return lines from my sump siphoned water to my sump and caused a mess. The siphon break holes that I had drilled in the pvc became clogged with Coraline algae(MY Fault) I opened them up and all should be Aok now. If you are using siphon break holes you might want to chech them out. I wish I would have. Anyway all is well anI just wanted to share.