The main difference between anion and cation exchange resins is that one is positively charged (cation) and the other is negatively charged (anion). This makes them useful in removing different types of
contaminants (which will also vary depending on their size and chemical composition). Cation and anion
resin beads can be used together (mixed bed configuration) or in separate vessels (twin bed
configuration), depending on the needs of the facility and if total removal of positively and negatively
charged ions are required.
Although anion and cation exchange resins are the main two categories of resins used in ion exchange,
there are four main types for standard water treatment that include:
Strong base anion
Weak base anion
Strong acid cation
Weak acid cation
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