Two Bed Up-flow Demineraliser Plant AD20/U Water free from minerals is called demineralised water. Water Two Bed Up-flow Demineraliser Plant contains many minerals salts in dissolved form which is called dissolved solids. To remove salts from water, it is treated with cation and Anoin resin coloum. The raw water is passed through cation resin coloum (H+ form) which converts an ionized salts to equivalent acids, now the acidic water is passed through Anion coloum (OH form) which absorbs acids and water available is Dimineralised water When the resins are exhusted the cation resin coloum is regenerated with HCI and Anion Resin coloum with NaOH solution. After regeneration now the plant will be in position to give deionised water up to next regeneration.