Purolite A-520E is a macroporous strong base anion resin which is specially designed for the removal of nitrates from water for potable precosses.  The macropous matrix and special ion exchange group functionality imparts ideal nitrate selectivity to Purolite A-520E making this resin particularly suitable for nitrate removal even when moderate to high concentrations of sulfate are present.  Hence this resin gives superior performance in nitrate removal applications when campared with standard resins.