Strongly basic and weakly basic gel and macroporous anion exchange resins are offered in various ionic forms to suit the specific application. Type 1 and Type 2 strongly basic anions are most commonly used in the hydroxide or chloride forms. Hydroxide for higher purity applications where full anion deionization is desired and chloride form for other applications or when users plan to regenerate to the hydroxide form on site. In some cases, the sulfate form is preferred. Weakly basic anions are often used in the free base form and are more easily regenerated with near stoichiometric quantities of regenerant chemicals.