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If this idea has been offered already, my apologies.
Theoretically, if you add water to the sump, only the sump level should increase. Observing the display tank level increase and sump level decrease means the pump velocity changed. I am not following the idea that the return flow from the display becomes choked. How high does a water addition raise the sump level? Can you reproduce this effect by you adding water manually instead of than the ATO system? You would have to determine the level that triggers the ATO and then you add the water at the same rate as the ATO.
Theoretically, if you add water to the sump, only the sump level should increase. Observing the display tank level increase and sump level decrease means the pump velocity changed. I am not following the idea that the return flow from the display becomes choked. How high does a water addition raise the sump level? Can you reproduce this effect by you adding water manually instead of than the ATO system? You would have to determine the level that triggers the ATO and then you add the water at the same rate as the ATO.