Today if you have your water tanks filled, and you go make food, the Pumps engages and the Tanks are never touched.
Add a switch that allow us the setup how we want the network to behave, if we want the Tanks to deplete to a certain level first before engaging the Pumps or if we want it to be as it is now, a backup for when there is no Power or damage or any reason why production stopped.
Today there is little reason to have a Tank since production from the Pumps happen regardless.
I do control it manually today with an extender, I just turn off the Pumps. But that is not ideal.