I found the same problem. Less than half of the ZEOvit was below the high water mark of my sump. I looked at increasing the depth of the water in the sump but became concerned about the possibility of flood during a power outage. I know that this would be for a short period of time as after your first or second cycle of ZEOvit change out the pump in the reactor will run all the time 24/7. I decided to leave the pump on 24/7 and adjust the flow to half for the break in period. My reactor had a flow valve so it was just an adjustment to reduce the water volume to half. You have to do something as the bacteria will die if the water flow is shut off and the ZEOvit is left to dry out.
Tom R
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