A method of producing an apparatus for removal of ions from water. A stack of the apparatus may be manufactured by: providing a first electrode with a first current collector; providing a spacer on top of the first electrode; and providing a second electrode on top of the spacer. The first electrode may be connected with a first connector to a first power terminal and a pressure may be exerted on the stack so as to move the first and/or second electrodes. The first connector may allow movement of the first electrode with respect to the first power terminal.