Abstract: A manifold system is constructed for evenly distributing a liquid to, and/or evenly collecting a liquid from, a cell of a separator system. The flow paths between the manifold inlet(s) and manifold outlet(s) are all approximately hydraulically identical in numbers, types, and dimensions of flow components, such that: (a) the flow rates to/from each of multiple inlets/outlets is equivalent, even with changes in overall pressure drop or flow rate, and (b) the time required for liquid to traverse each of the manifold flow paths is approximately identical, enabling plug flow through the cell.