I have been playing with the sump today waitng for a check valve for the return line. I have found 3 issues that I would like to try to solve and I need some help.
Issue #1) As mentioned before, I am having problems breaking the siphon on the return line when I shut off the power. Right now I have a dual Locline return nozzle in DT that I would like to run. One nozzle at the top and the other pointed down to get flow at the back. When I cut the power and if either one of the nozzles are below the water level it will drain and not stop until the water drops below the bulkhead. The bulkhead inside the overflow is 2 inches below the water level in the Display tank. I drilled a hole in the elbow inside the overflow and ran it into the DT, just below water level so that it is exposed quickly to draw air. Still the same problem, even when the line is exposed it draws air but not enough to break the siphon.
Solutions that I am thinking about
:
1) Check valve somewhere. I'm going to add one anyway for redundancy, but I don't really like having this as the only safegaurd.
2) Rebuild return inside the overflow using flexline as it is now, but raising the elbow up higher so that it is higher than the water level in the tank.
Will this difference in height do the trick. I would still need the airline wouldn't I ??
3) Make this a Herbie instead and drill a return line.