5
Water Saver Pretreatment System
The Water Saver system uses capacitive deionization technology to reduce dissolved ion concentration, thus lowering the makeup
water conductivity prior to use in an evaporative cooling system. Makeup water entering the Water Saver passes through individual
cylinders which contain oppositely charged supercapacitor surfaces. Dissolved ions (except silica) are removed from the water as
they are adsorbed onto the charged capacitor. A 50% ion reduction allows the operating cycles of concentration to be safely
doubled without an increase in scale or corrosion potential. Figure 3 describes the capacitive deionization process. Figure 4
shows an up-close view of a cylinder.
Figure 3: Illustration of EWS Cycles
Figure 4: Illustration of EWS Cylinder
Principle of Operation
Makeup water flows into a cylinder
Supercapacitors attract oppositely
charged ions from the makeup water
Supercapacitors reverse polarity to
reject ions to drain at reduced flow rate
Raw makeup water
enters the cylinder
Reduced conductivity
water exits the cylinder
