There are chloramine specific RO/DI systems. Bulk Reef Supply is where I got my RO/DI that I use for my reef tank. I didnt need the Chloramine one because I'm on a well. I have the 75GPD and it works great.
http://www.bulkreefsupply.com/store/7.html
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Approximately 10% of city municipal waters systems use chloramines to process water. Standard RO filters and units will not remove chloramines from the water. If your household water supply contains chloramines you will need a chloramines specific reverse osmosis unit. To find out what's in your water contact your city and ask for a water report.
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Only a Chloramine specific carbon block will remove Chloramine.