RESINTECH SIR-22P-HP RESINTECH SIR-100-HP is a strong base anion exchange resin supplied in the chloride form as moist, tough, uniform spherical beads. It is especially useful in nitrate removal applications due to its ability to remove nitrates preferentially in the presence of sulfates and other divalent ions. The use of RESINTECH SIR-100-HP eliminates nitrate dumping and retains a greater degree of its operating capacity in the presence of high levels of sulfates where standard anion resins such as ResinTech SBG1, SBG1P, or SBG2, would suffer loss in operating efficiencies and exhibit nitrate dumping in the presence of sulfates.