Ion exchange resins

These resins are used to remove dissolved ions and, thus, ‘’deionize’’ the water. It is the last and, the most advanced phase of purification in the process to make ultra-pure water. Resins are spheres of diameter of less then a millimetre composed by polymer. They are solid and porous and bind ions in a non permanent state. In solutions that contain ions with similar charges they give rise to a process called ‘’ion exchange’’, i.e. they release their ions and capture those of the solution.