The most popular ion-exchange anion resins by type are:
Type I strong base anion(SBA) resin has the strongest affinity for weak acids but lower regeneration efficiency which equates to lower capacity.
SBA Type I macroporous anions are often used for organics or tannin reduction.
Regeneration is with brine making it suitable for residential purposes.
Nitrate selective SBA Type I macroporous anions are also available for nitrate reduction of potable water. (SBA Type II also removes nitrate but is not selective. It is commonly used where equipment operators are present.)
Higher regeneration efficiency is attained by increasing regenerant temperature for SBA Type I.
Using salt alone is often satisfactory but in combination with caustic soda, there is a greater reduction in alkalinity leakage and carbon dioxide. (When using the brine/caustic combination it is necessary to pre-soften to avoid precipitation of calcium and magnesium compounds.)
Type II strong base anion resin has less affinity but is strong enough to remove weak acids for most applications. SBA Type II resin has considerably greater regeneration efficiency thus higher capacity.
SBA Type II lacks the chemical stability of SBA Type I resins and cannot withstand high temperatures. It will significantly reduce its capacity.
SBA Type II resins are commonly used for dealkalization purposes.
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