RWT is skilled to design and make mixed bed polishing units to suit all of our customer’s requirements.

Cation and Anion resins are combined in a MSRL of FRP vessel to produce ultra-pure water.

Usually a mixed bed unit contains strong acid Cation (SAC) resin and strong base Anion (SBA) resins united to a ratio of approximately 40% Cation resin to 60% Anion resin. (All resin volumes are dependent upon the feed water analysis and the required quantity of treated water).

Mixed bed polishers are typically connected when a water quality of less than 1 micro ohm conductivity is required. Normally mixed bed polishers are installed after a standard Reverse Osmosis or De mineralizer (DM Plant), to produce ultra-high quality water.

The Cation resins in mixed bed units are of a higher specific gravity and settle at the bottom of the vessel at the same time the Anion resin will automatically float to the top.

Note: The Cation resin must be a strong acid Cation type (SAC) and the Anion resin must be a strong base Anion resin (SBA)

After a service cycle, each resin is regenerated as below:

• (SAC): Strong Acid Cation resin is washed with approx. 30% hydrochloric acid.
• (SBA): Strong Base Anion is washed with approx. 26% caustic.

Note:  The above redevelop strengths refer to the values before being diluted by the mixed bed unit educator systems.