H-cation exchange

Water treatment by means of H-cation exchange is intended for removal of all cations from the water and their exchange for hydrogen ions. Water downstream the H-cation filters contains excess of H ions, and as a result has acidic reaction, that's why this technology is used along with other ion-exchange processes - Na-cation exchange and anion exchange.
Application of counter-flow regeneration in the ion-exchange filters contributes to lower consumption of chemicals, improvement of the permeate quality.
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* The text is taken from:
A.S. Kopylov, V.M. Lavygin, V.F. Ochkov, "Water-treatment in power energetics"
(M. MEI Publishing House, 2003).