The CP2 H⁺Form (9 × 24 mm) column is a higher-capacity version in the hydronium form, with a void volume of approximately 825 μL. The CP2 is recommended for large-volume sample preconcentration applications using an external pump. The Cation Polisher Columns can be regenerated off-line approximately every 2-3 months (depending on the level of contamination and usage).

Polishing reduces interference from cations, increasing anion conductivity.