Methods of Providing Inlets and Outlets to Cell Pairs in Wound ED Devices

An electrochemical separation device, comprising:

• a first electrode;
• a plurality of cell pairs wound around the first electrode to form a bundle;
• each of the plurality of cell pairs comprising an ion concentrating compartment and an adjacent ion diluting compartment;
• the ion concentrating compartment comprising a first spacer having a masked portion and a potted portion;
• the adjacent ion diluting compartment comprising a second spacer having a masked portion and a potted portion;
• the masked and potted portions of the first and second spacers being in an alternating alignment;
• a concentrate stream channel extending through the masked portion of first spacer and the potted portion of the second spacer, the concentrate stream channel being in fluid communication with the ion concentrating compartment and in fluid isolation from the ion diluting compartment;
• a dilute stream channel extending through the potted portion of the first spacer and the masked portion of the second spacer, the dilute stream channel being in fluid isolation from the ion concentrating compartment and in fluid communication with the ion diluting compartment;
• and
• a second electrode surrounding the bundle.