How does DI (deionization) of water result in spot-free window cleaning? March 06 2020

A little info on DI mixed bed resin and its function.

DI standards for Dionization:

The process used for removal of all dissolved salts from water is referred to asdeionization. Deionization requires the flow of water through two ion exchange materials in order to affect the removal of all salt content.

 Deionization. The terms demineralization and deionization are used somewhat interchangeably by the industry. While the term demineralization is generally better understood, deionization is especially apt.

 The passage of water through the first exchange material removes the calcium and magnesium ions just as in the normal softening process. Unlike home equipment, deionization units also remove all other positive metallic ions in the process and replace them with hydrogen ions instead of sodium ions.

 Mixed bed DI resin is made up of Cation beads and Anion beads.

 CATION DEIONIZERS have a high capacity to remove positively charged dissolved ionic contaminants such as calcium, sodium, magnesium, potassium, iron, and manganese (used in conjunction with an anion deionizer they can produce a quality in excess of 400,000 ohm/cm. ( 0.9 ppm TDS as CaCO3).

 ANION BED DEIONIZERS have a high capacity to remove negatively charged dissolved ionic contaminants such as carbonate, bicarbonates, sulfates, chlorides, nitrates and silica (used in conjunction with a cation deionizer they can produce a quality in excess of 400,000 ohm/cm. ( 0.9ppm TDS as CaCO3)

 It is all the mineral content in water that can cause spotting on the glass. However, DI water is water that has the minerals removed by the cation and anion charged resin beads. Resulting in spot-free results.