Tunze osmolator problem

[furrymurray]

I am setting up an osmolator and having a problem. The container tank that I am using is higher than the sump but lower that the display tank and the top off is going into the sump. What is happening is it is creating a siphon. The pump will turn and pump water and then shut off but top off water will continue to drain in my sump (it is at a slow rate compared to when the pump for the ato is on.) any suggestions on how to fix this? Can I put the ato discharge line into the display tank (maybe inside the overflow?) that way it will be higher that the water level of the tank?