THERE ARE MANY MANAFACTORS OF RESIN ,MAKE sure its a mixed bed resin then you can use it strait from the bag in your di vessel.
the other resins are canion anion resins which are kept in seperate vessels and are recharged by a mix of sodium and hydrocloric acid [ elga systems.] Ihave one of the later,not had it running properly yet , two mixed resin vessels, and an ro man ro system.
gaza