Booms cube-80

[JDigital]

Originally Posted by Boomboy

do you mean in the sump part or in the tank part?

He was talking about the Tank water line. Which means for a siphon to work, your return plumbing needs to higher than the water line... You will usually see a siphon break on plumbing that comes up over the tank rim and back down under the water.

That's why I suggested check valves, because I was (and still am) under the impression that your return plumbing comes back in on the top 2 bulkheads on the back of your tank?