I run the BRS 5 stage as well. I actually have 2 of the Chloramines carbon blocks in my system. I live in Anaheim and the city water here is notoriously bad. Anaheim has been using Chloramines as long as I can remember. As a general rule, I would run the chloramines carbon block. As Kenny (babyjess) mentioned above, by the time you hear about the city adding Chloramines, it'd be too late. always better safe than sorry.