If it is a standard ...

If it is a standard poly-amide membrane, SOME form of chlorine removal will be necessary.

You can use bisulfite, activated carbon and UV.  The advantages of bisulfite are that it is the cheapest of the three options from a capital standpoint, and probably the cheapest long-term from an operating standpoint.

As for disadvantages, make sure you get a stabilized product or it can break-down over time and lose its effectiveness.  Over-dosing can cause micro-problems.  You have to make sure your pump stays primed and operating, and that you are dosing at the correct level 

P.S. - (Edit)  Sorry, I should have looked closer at your job.  In the beverage market, companies have traditionally used activated carbon somewhere in the water treatment process to ensure sufficient removal of organics that can cause taste and odor issues.  An RO will reject salts with greater efficiency than organics.  So, while an RO may reject enough organics to avoid issues, carbon has typically been seen as "insurance" against organics.  Shoot an email to this guy: michael.mcdonald@suez.com.  You can tell him I sent you his email.