Halfway between purification and reuse, Salher designs the polishing treatments to obtain ultrapure water. Thus, we find the compact drinking water treatment plants by demineralization / electrodeionization, reference PUR-EDI, with which an excellent quality treated water is obtained, and the compact purification plants by continuous electrodeionization, reference PUR-CEDI.This ion exchange demineralization equipment or electrodeionization module for the production of ultrapure water consists of a polishing system applied to previously osmotized waters with which it is possible to produce water with less than 0.1 μs / cm of conductivity. The residual silica concentrations can reach values of up to 1 g / l.