ResinTech SIR-300 is a sodium form macroporous chelating weak acid cation resin. SIR-300 has unique chelating functionality and is able to remove divalent transition metals preferentially to alkaline earth metals such as calcium. SIR-300 is intended for removal of low to moderate concentrations of heavy metals from waste streams. SIR-300 is supplied in the sodium form, can be special ordered in the hydrogen form (as SIR-300-H), or in the buffered form (as SIR-300 pH ADJ).