Matt Rize
Hashmaster
I am pretty sure you can just run the water through activated charcoal to remove the chloramine. I fill my res and run it through a cheap fish tank filter for 12 hour and change the carbon every month.
Running the water thru a carbon filter for 12 hours does change the function of the filter. You can get chloramine testers at the pet store in the fish section to see if that works. I guess this function of the carbon filter depends on the res size and filter size.